Given the question: Frederik van Zyl Slabbert - Frederik Van Zyl Slabbert (2 March 1940 14 May 2010) was a South African political analyst businessman and politician. He is best known for having been the leader of the official opposition the Progressive Federal Party (PFP) in the House of Assembly from 1979 to 1986. 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?
The answer is:
Office Holder