instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which play and film was adapted from a story by Christopher Isherwood and later adapted as the musical and film Cabaret?
answer:
cabaret

question:
Chep Lap Kok airport is located where?
answer:
hong kong international airport

question:
The site of the 1461 Battle of Mortimer's Cross lies in which English county?
answer:
battle of mortimer's cross