Question:
Who was the chair of Industrial Union of Metal in Sep, 1989?

Context:
 Reinhard Sommer is the chair of Industrial Union of Metal from Jan, 1961 to Jan, 1988. 
 Artur Baumann is the chair of Industrial Union of Metal from Jan, 1953 to Jan, 1953. 
 Hartwig Bugiel is the chair of Industrial Union of Metal from Jan, 1989 to Jan, 1990. 
 Gerhard Nennstiel is the chair of Industrial Union of Metal from Jan, 1988 to Jan, 1989. 
 Herbert Dönitz is the chair of Industrial Union of Metal from Jan, 1957 to Jan, 1960.

Answer:
Question:
Who was the chair of Industrial Union of Metal in Sep, 1989?

Context:
 Reinhard Sommer is the chair of Industrial Union of Metal from Jan, 1961 to Jan, 1988. 
 Artur Baumann is the chair of Industrial Union of Metal from Jan, 1953 to Jan, 1953. 
 Hartwig Bugiel is the chair of Industrial Union of Metal from Jan, 1989 to Jan, 1990. 
 Gerhard Nennstiel is the chair of Industrial Union of Metal from Jan, 1988 to Jan, 1989. 
 Herbert Dönitz is the chair of Industrial Union of Metal from Jan, 1957 to Jan, 1960.

Answer:
user
Hartwig Bugiel
assistant
Question:
Who was the chair of Industrial Union of Metal in Sep, 1989?

Context:
 Reinhard Sommer is the chair of Industrial Union of Metal from Jan, 1961 to Jan, 1988. 
 Artur Baumann is the chair of Industrial Union of Metal from Jan, 1953 to Jan, 1953. 
 Hartwig Bugiel is the chair of Industrial Union of Metal from Jan, 1989 to Jan, 1990. 
 Gerhard Nennstiel is the chair of Industrial Union of Metal from Jan, 1988 to Jan, 1989. 
 Herbert Dönitz is the chair of Industrial Union of Metal from Jan, 1957 to Jan, 1960.

Answer:
user
Reinhard Sommer
Herbert Dönitz
Artur Baumann
Gerhard Nennstiel
assistant
Question:
Who was the chair of Industrial Union of Metal in Sep, 1989?

Context:
 Reinhard Sommer is the chair of Industrial Union of Metal from Jan, 1961 to Jan, 1988. 
 Artur Baumann is the chair of Industrial Union of Metal from Jan, 1953 to Jan, 1953. 
 Hartwig Bugiel is the chair of Industrial Union of Metal from Jan, 1989 to Jan, 1990. 
 Gerhard Nennstiel is the chair of Industrial Union of Metal from Jan, 1988 to Jan, 1989. 
 Herbert Dönitz is the chair of Industrial Union of Metal from Jan, 1957 to Jan, 1960.

Answer:
user
Hartwig Bugiel
assistant