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

Example Input: In which film of 1995 did Robert De Niro and Al Pacino appear on screen together for the first time?
Example Output: al pacino

Example Input: What city is closest to Copacabana beach?
Example Output: copacabana, rio de janeiro

Example Input: Which actress played Dorien in the TV sitcom `Birds of a Feather`?
Example Output:
birds of a feather