instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Chep Lap Kok airport is located where?
answer:
hong kong international airport

question:
Which former Portuguese African Colony joined the British Commonwealth in 1995?
answer:
commonwealth of nations

question:
Which 1987 film stars Eddie Murphy as Axel Foley?
answer:
eddie murphy