Question:
Who was the chair of Union of Trade in Dec, 1950?

Context:
 Bruno Sommerer is the chair of Union of Trade from Jan, 1949 to Jan, 1952. 
 Margarete Götzelt is the chair of Union of Trade from Jan, 1954 to Jan, 1958. 
 Siegfried Michl is the chair of Union of Trade from Jan, 1952 to Jan, 1954.

Answer:
Question:
Who was the chair of Union of Trade in Dec, 1950?

Context:
 Bruno Sommerer is the chair of Union of Trade from Jan, 1949 to Jan, 1952. 
 Margarete Götzelt is the chair of Union of Trade from Jan, 1954 to Jan, 1958. 
 Siegfried Michl is the chair of Union of Trade from Jan, 1952 to Jan, 1954.

Answer:
user
Bruno Sommerer
assistant
Question:
Who was the chair of Union of Trade in Dec, 1950?

Context:
 Bruno Sommerer is the chair of Union of Trade from Jan, 1949 to Jan, 1952. 
 Margarete Götzelt is the chair of Union of Trade from Jan, 1954 to Jan, 1958. 
 Siegfried Michl is the chair of Union of Trade from Jan, 1952 to Jan, 1954.

Answer:
user
Siegfried Michl
Margarete Götzelt
assistant
Question:
Who was the chair of Union of Trade in Dec, 1950?

Context:
 Bruno Sommerer is the chair of Union of Trade from Jan, 1949 to Jan, 1952. 
 Margarete Götzelt is the chair of Union of Trade from Jan, 1954 to Jan, 1958. 
 Siegfried Michl is the chair of Union of Trade from Jan, 1952 to Jan, 1954.

Answer:
user
Bruno Sommerer
assistant