Question:
Who was the chair of MIT Department of Economics in Aug, 1957?

Context:
 Davis Rich Dewey is the chair of MIT Department of Economics from Jan, 1893 to Jan, 1933. 
 Ann Friedlaender is the chair of MIT Department of Economics from Jan, 1983 to Jan, 1984. 
 Edgar Cary Brown is the chair of MIT Department of Economics from Jan, 1964 to Jan, 1982. 
 Robert Lyle Bishop is the chair of MIT Department of Economics from Jan, 1958 to Jan, 1964. 
 Ralph E. Freeman is the chair of MIT Department of Economics from Jan, 1933 to Jan, 1958.

Answer:
Question:
Who was the chair of MIT Department of Economics in Aug, 1957?

Context:
 Davis Rich Dewey is the chair of MIT Department of Economics from Jan, 1893 to Jan, 1933. 
 Ann Friedlaender is the chair of MIT Department of Economics from Jan, 1983 to Jan, 1984. 
 Edgar Cary Brown is the chair of MIT Department of Economics from Jan, 1964 to Jan, 1982. 
 Robert Lyle Bishop is the chair of MIT Department of Economics from Jan, 1958 to Jan, 1964. 
 Ralph E. Freeman is the chair of MIT Department of Economics from Jan, 1933 to Jan, 1958.

Answer:
user
Ralph E. Freeman
assistant
Question:
Who was the chair of MIT Department of Economics in Aug, 1957?

Context:
 Davis Rich Dewey is the chair of MIT Department of Economics from Jan, 1893 to Jan, 1933. 
 Ann Friedlaender is the chair of MIT Department of Economics from Jan, 1983 to Jan, 1984. 
 Edgar Cary Brown is the chair of MIT Department of Economics from Jan, 1964 to Jan, 1982. 
 Robert Lyle Bishop is the chair of MIT Department of Economics from Jan, 1958 to Jan, 1964. 
 Ralph E. Freeman is the chair of MIT Department of Economics from Jan, 1933 to Jan, 1958.

Answer:
user
Edgar Cary Brown
Robert Lyle Bishop
Davis Rich Dewey
Ann Friedlaender
assistant
Question:
Who was the chair of MIT Department of Economics in Aug, 1957?

Context:
 Davis Rich Dewey is the chair of MIT Department of Economics from Jan, 1893 to Jan, 1933. 
 Ann Friedlaender is the chair of MIT Department of Economics from Jan, 1983 to Jan, 1984. 
 Edgar Cary Brown is the chair of MIT Department of Economics from Jan, 1964 to Jan, 1982. 
 Robert Lyle Bishop is the chair of MIT Department of Economics from Jan, 1958 to Jan, 1964. 
 Ralph E. Freeman is the chair of MIT Department of Economics from Jan, 1933 to Jan, 1958.

Answer:
user
Ralph E. Freeman
assistant