Question: Which director, Piers Haggard or Penelope Spheeris, is best known as a documentary film director whose works include the trilogy titled "The Decline of Western Civilization"?
Sentence (from "Piers Haggard"): Piers Inigo Haggard OBE (born 18 March 1939) is a British theatre, film and television director, although he has worked mostly in the latter.
Relevant evidence: Yes