Answer the following question: Robert M. Morgenthau - Robert Morris Morgenthau (/mrn/ MORG-n-thaw; born July 31 1919) is an American lawyer. From 1975 until his retirement in 2009 he was the District Attorney for New York County the borough of Manhattan. He is the second longest-serving district attorney in United States history; only Henry Wade of Dallas served longer. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
Answer:
Office Holder