Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

[Q]: In which film of 1995 did Robert De Niro and Al Pacino appear on screen together for the first time?
[A]: al pacino


[Q]: To which country do the Chatham Islands belong?
[A]: chatham islands


[Q]: Which of these ballets was not written by Tchaikovsky?
[A]:
ballet