Question:
Who was the chair of History of Medicine Society in Apr, 1956?

Context:
 Robert Oswald Moon is the chair of History of Medicine Society from Jan, 1931 to Jan, 1933. 
 Douglas James Guthrie is the chair of History of Medicine Society from Jan, 1956 to Jan, 1957. 
 Arthur MacNalty is the chair of History of Medicine Society from Jan, 1945 to Jan, 1947. 
 Sir Norman Moore, 1st Baronet is the chair of History of Medicine Society from Jan, 1913 to Jan, 1916. 
 Cuthbert Dukes is the chair of History of Medicine Society from Jan, 1959 to Jan, 1960. 
 Walter Langdon-Brown is the chair of History of Medicine Society from Jan, 1942 to Jan, 1944. 
 Sir Weldon Dalrymple-Champneys, 2nd Baronet is the chair of History of Medicine Society from Jan, 1957 to Jan, 1959. 
 William Osler is the chair of History of Medicine Society from Jan, 1912 to Jan, 1913. 
 Aileen Adams is the chair of History of Medicine Society from Jan, 1994 to Jan, 1995. 
 Alfred Webb-Johnson, 1st Baron Webb-Johnson is the chair of History of Medicine Society from Jan, 1952 to Jan, 1954. 
 Peter Maxwell Daniel is the chair of History of Medicine Society from Jan, 1979 to Jan, 1981. 
 David Innes Williams is the chair of History of Medicine Society from Jan, 1999 to Jan, 2000. 
 W. S. C. Copeman is the chair of History of Medicine Society from Jan, 1964 to Jan, 1966. 
 Henry Cohen, 1st Baron Cohen of Birkenhead is the chair of History of Medicine Society from Jan, 1966 to Jan, 1968. 
 St Clair Thomson is the chair of History of Medicine Society from Jan, 1933 to Jan, 1935.

Answer:
Question:
Who was the chair of History of Medicine Society in Apr, 1956?

Context:
 Robert Oswald Moon is the chair of History of Medicine Society from Jan, 1931 to Jan, 1933. 
 Douglas James Guthrie is the chair of History of Medicine Society from Jan, 1956 to Jan, 1957. 
 Arthur MacNalty is the chair of History of Medicine Society from Jan, 1945 to Jan, 1947. 
 Sir Norman Moore, 1st Baronet is the chair of History of Medicine Society from Jan, 1913 to Jan, 1916. 
 Cuthbert Dukes is the chair of History of Medicine Society from Jan, 1959 to Jan, 1960. 
 Walter Langdon-Brown is the chair of History of Medicine Society from Jan, 1942 to Jan, 1944. 
 Sir Weldon Dalrymple-Champneys, 2nd Baronet is the chair of History of Medicine Society from Jan, 1957 to Jan, 1959. 
 William Osler is the chair of History of Medicine Society from Jan, 1912 to Jan, 1913. 
 Aileen Adams is the chair of History of Medicine Society from Jan, 1994 to Jan, 1995. 
 Alfred Webb-Johnson, 1st Baron Webb-Johnson is the chair of History of Medicine Society from Jan, 1952 to Jan, 1954. 
 Peter Maxwell Daniel is the chair of History of Medicine Society from Jan, 1979 to Jan, 1981. 
 David Innes Williams is the chair of History of Medicine Society from Jan, 1999 to Jan, 2000. 
 W. S. C. Copeman is the chair of History of Medicine Society from Jan, 1964 to Jan, 1966. 
 Henry Cohen, 1st Baron Cohen of Birkenhead is the chair of History of Medicine Society from Jan, 1966 to Jan, 1968. 
 St Clair Thomson is the chair of History of Medicine Society from Jan, 1933 to Jan, 1935.

Answer:
user
Douglas James Guthrie
assistant
Question:
Who was the chair of History of Medicine Society in Apr, 1956?

Context:
 Robert Oswald Moon is the chair of History of Medicine Society from Jan, 1931 to Jan, 1933. 
 Douglas James Guthrie is the chair of History of Medicine Society from Jan, 1956 to Jan, 1957. 
 Arthur MacNalty is the chair of History of Medicine Society from Jan, 1945 to Jan, 1947. 
 Sir Norman Moore, 1st Baronet is the chair of History of Medicine Society from Jan, 1913 to Jan, 1916. 
 Cuthbert Dukes is the chair of History of Medicine Society from Jan, 1959 to Jan, 1960. 
 Walter Langdon-Brown is the chair of History of Medicine Society from Jan, 1942 to Jan, 1944. 
 Sir Weldon Dalrymple-Champneys, 2nd Baronet is the chair of History of Medicine Society from Jan, 1957 to Jan, 1959. 
 William Osler is the chair of History of Medicine Society from Jan, 1912 to Jan, 1913. 
 Aileen Adams is the chair of History of Medicine Society from Jan, 1994 to Jan, 1995. 
 Alfred Webb-Johnson, 1st Baron Webb-Johnson is the chair of History of Medicine Society from Jan, 1952 to Jan, 1954. 
 Peter Maxwell Daniel is the chair of History of Medicine Society from Jan, 1979 to Jan, 1981. 
 David Innes Williams is the chair of History of Medicine Society from Jan, 1999 to Jan, 2000. 
 W. S. C. Copeman is the chair of History of Medicine Society from Jan, 1964 to Jan, 1966. 
 Henry Cohen, 1st Baron Cohen of Birkenhead is the chair of History of Medicine Society from Jan, 1966 to Jan, 1968. 
 St Clair Thomson is the chair of History of Medicine Society from Jan, 1933 to Jan, 1935.

Answer:
user
Sir Weldon Dalrymple-Champneys, 2nd Baronet
Sir Norman Moore, 1st Baronet
Peter Maxwell Daniel
William Osler
Walter Langdon-Brown
Robert Oswald Moon
W. S. C. Copeman
Aileen Adams
Henry Cohen, 1st Baron Cohen of Birkenhead
St Clair Thomson
Cuthbert Dukes
David Innes Williams
Arthur MacNalty
Alfred Webb-Johnson, 1st Baron Webb-Johnson
assistant
Question:
Who was the chair of History of Medicine Society in Apr, 1956?

Context:
 Robert Oswald Moon is the chair of History of Medicine Society from Jan, 1931 to Jan, 1933. 
 Douglas James Guthrie is the chair of History of Medicine Society from Jan, 1956 to Jan, 1957. 
 Arthur MacNalty is the chair of History of Medicine Society from Jan, 1945 to Jan, 1947. 
 Sir Norman Moore, 1st Baronet is the chair of History of Medicine Society from Jan, 1913 to Jan, 1916. 
 Cuthbert Dukes is the chair of History of Medicine Society from Jan, 1959 to Jan, 1960. 
 Walter Langdon-Brown is the chair of History of Medicine Society from Jan, 1942 to Jan, 1944. 
 Sir Weldon Dalrymple-Champneys, 2nd Baronet is the chair of History of Medicine Society from Jan, 1957 to Jan, 1959. 
 William Osler is the chair of History of Medicine Society from Jan, 1912 to Jan, 1913. 
 Aileen Adams is the chair of History of Medicine Society from Jan, 1994 to Jan, 1995. 
 Alfred Webb-Johnson, 1st Baron Webb-Johnson is the chair of History of Medicine Society from Jan, 1952 to Jan, 1954. 
 Peter Maxwell Daniel is the chair of History of Medicine Society from Jan, 1979 to Jan, 1981. 
 David Innes Williams is the chair of History of Medicine Society from Jan, 1999 to Jan, 2000. 
 W. S. C. Copeman is the chair of History of Medicine Society from Jan, 1964 to Jan, 1966. 
 Henry Cohen, 1st Baron Cohen of Birkenhead is the chair of History of Medicine Society from Jan, 1966 to Jan, 1968. 
 St Clair Thomson is the chair of History of Medicine Society from Jan, 1933 to Jan, 1935.

Answer:
user
Douglas James Guthrie
assistant