Question:
Who was the head of Mannheim in Aug, 1981?

Context:
 Ludwig Ratzel is the head of the government of Mannheim from Jan, 1972 to Jan, 1980. 
 Gerhard Widder is the head of the government of Mannheim from Jan, 1983 to Jan, 2007. 
 Wilhelm Varnholt is the head of the government of Mannheim from Jan, 1980 to Jan, 1983.

Answer:
Wilhelm Varnholt