Question:
Who was the chair of Yenching University in Mar, 1927?

Context:
 Lu Zhiwei is the chair of Yenching University from Jan, 1945 to Jan, 1949. 
 John Leighton Stuart is the chair of Yenching University from Jan, 1919 to Jan, 1945. 
 Weng Dujian is the chair of Yenching University from Jan, 1949 to Jan, 1952.

Answer:
Question:
Who was the chair of Yenching University in Mar, 1927?

Context:
 Lu Zhiwei is the chair of Yenching University from Jan, 1945 to Jan, 1949. 
 John Leighton Stuart is the chair of Yenching University from Jan, 1919 to Jan, 1945. 
 Weng Dujian is the chair of Yenching University from Jan, 1949 to Jan, 1952.

Answer:
user
John Leighton Stuart
assistant
Question:
Who was the chair of Yenching University in Mar, 1927?

Context:
 Lu Zhiwei is the chair of Yenching University from Jan, 1945 to Jan, 1949. 
 John Leighton Stuart is the chair of Yenching University from Jan, 1919 to Jan, 1945. 
 Weng Dujian is the chair of Yenching University from Jan, 1949 to Jan, 1952.

Answer:
user
Weng Dujian
Lu Zhiwei
assistant
Question:
Who was the chair of Yenching University in Mar, 1927?

Context:
 Lu Zhiwei is the chair of Yenching University from Jan, 1945 to Jan, 1949. 
 John Leighton Stuart is the chair of Yenching University from Jan, 1919 to Jan, 1945. 
 Weng Dujian is the chair of Yenching University from Jan, 1949 to Jan, 1952.

Answer:
user
John Leighton Stuart
assistant