Question:
Who was the head of Fourth Labour Government of New Zealand in Sep, 1990?

Context:
 Geoffrey Palmer is the head of the government of Fourth Labour Government of New Zealand from Aug, 1989 to Sep, 1990. 
 David Lange is the head of the government of Fourth Labour Government of New Zealand from Aug, 1987 to Aug, 1989. 
 Mike Moore is the head of the government of Fourth Labour Government of New Zealand from Sep, 1990 to Nov, 1990.

Answer:
Question:
Who was the head of Fourth Labour Government of New Zealand in Sep, 1990?

Context:
 Geoffrey Palmer is the head of the government of Fourth Labour Government of New Zealand from Aug, 1989 to Sep, 1990. 
 David Lange is the head of the government of Fourth Labour Government of New Zealand from Aug, 1987 to Aug, 1989. 
 Mike Moore is the head of the government of Fourth Labour Government of New Zealand from Sep, 1990 to Nov, 1990.

Answer:
user
Mike Moore
assistant
Question:
Who was the head of Fourth Labour Government of New Zealand in Sep, 1990?

Context:
 Geoffrey Palmer is the head of the government of Fourth Labour Government of New Zealand from Aug, 1989 to Sep, 1990. 
 David Lange is the head of the government of Fourth Labour Government of New Zealand from Aug, 1987 to Aug, 1989. 
 Mike Moore is the head of the government of Fourth Labour Government of New Zealand from Sep, 1990 to Nov, 1990.

Answer:
user
David Lange
David Lange
Geoffrey Palmer
assistant
Question:
Who was the head of Fourth Labour Government of New Zealand in Sep, 1990?

Context:
 Geoffrey Palmer is the head of the government of Fourth Labour Government of New Zealand from Aug, 1989 to Sep, 1990. 
 David Lange is the head of the government of Fourth Labour Government of New Zealand from Aug, 1987 to Aug, 1989. 
 Mike Moore is the head of the government of Fourth Labour Government of New Zealand from Sep, 1990 to Nov, 1990.

Answer:
user
Mike Moore
assistant