Mario Zagari (born 14 September 1913 – 29 February 1996) was an Italian socialist politician who served in the Italian parliament and in the European parliament as well as in the Italian governments in various capacities. 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?
Answer:
Office Holder