Question: What was the politician's position that was in the biography Percy Jackson wrote?
Sentence (from "Robert Menzies"): Sir Robert Gordon Menzies, {'1': ", '2': ", '3': ", '4': "} (20 December 189415 May 1978), was the Prime Minister of Australia from 1939 to 1941 and again from 1949 to 1966.
Relevant evidence: Yes