Please answer the following question: Joseph Benedict Ben Chifley (/tfli/; 18851951) was an Australian politician who was the 16th Prime Minister of Australia from 1945 to 1949. He became Leader of the Labor Party on the death of John Curtin and went on to retain a majority in both Houses of the Australian Parliament at the 1946 election before his government was defeated at the 1949 election. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Office Holder