instruction:
Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.
question:
Who played Sandy in the 1975 film Grease?
answer:
olivia newton-john


question:
'Houses of the Holy' in 1973 was the fifth album released by which band, the first three contained the name of the band and the fourth was untitled?
answer:
led zeppelin


question:
Who played the starring role in the 1992 film 'Malcolm X'?
answer:

denzel washington