Question: What South African politician formed a government of national unity with nelson Mandela's African National Congress and Mangosuthu Buthelezi's Inkatha Freedom Party?
Sentence (from "F. W. de Klerk"): Frederik Willem de Klerk, DMS (] ; born 18 March 1936) is a South African politician who served as the country's State President from August 1989 to May 1994.
Relevant evidence: Yes