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:
What is the nationality of boxer Manny Pacquiao?
answer:
filipino


question:
In the TV programme '24', what is the name of the character played by Kiefer Sutherland?
answer:

jack bauer