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

Context:
 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. 
 Geoffrey Palmer is the head of the government of Fourth Labour Government of New Zealand from Aug, 1989 to Sep, 1990.

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

Context:
 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. 
 Geoffrey Palmer is the head of the government of Fourth Labour Government of New Zealand from Aug, 1989 to Sep, 1990.

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

Context:
 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. 
 Geoffrey Palmer is the head of the government of Fourth Labour Government of New Zealand from Aug, 1989 to Sep, 1990.

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

Context:
 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. 
 Geoffrey Palmer is the head of the government of Fourth Labour Government of New Zealand from Aug, 1989 to Sep, 1990.

Answer:
user
Geoffrey Palmer
assistant