Question:
Who was the head of Chemnitz in Jun, 1988?

Context:
 Dieter Noll is the head of the government of Chemnitz from Jan, 1990 to Jan, 1991. 
 Eberhard Langer is the head of the government of Chemnitz from Jan, 1986 to Jan, 1990. 
 Joachim Pilz is the head of the government of Chemnitz from Jan, 1991 to Jan, 1993.

Answer:
Question:
Who was the head of Chemnitz in Jun, 1988?

Context:
 Dieter Noll is the head of the government of Chemnitz from Jan, 1990 to Jan, 1991. 
 Eberhard Langer is the head of the government of Chemnitz from Jan, 1986 to Jan, 1990. 
 Joachim Pilz is the head of the government of Chemnitz from Jan, 1991 to Jan, 1993.

Answer:
user
Eberhard Langer
assistant
Question:
Who was the head of Chemnitz in Jun, 1988?

Context:
 Dieter Noll is the head of the government of Chemnitz from Jan, 1990 to Jan, 1991. 
 Eberhard Langer is the head of the government of Chemnitz from Jan, 1986 to Jan, 1990. 
 Joachim Pilz is the head of the government of Chemnitz from Jan, 1991 to Jan, 1993.

Answer:
user
Dieter Noll
Joachim Pilz
assistant
Question:
Who was the head of Chemnitz in Jun, 1988?

Context:
 Dieter Noll is the head of the government of Chemnitz from Jan, 1990 to Jan, 1991. 
 Eberhard Langer is the head of the government of Chemnitz from Jan, 1986 to Jan, 1990. 
 Joachim Pilz is the head of the government of Chemnitz from Jan, 1991 to Jan, 1993.

Answer:
user
Eberhard Langer
assistant