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

Example Input: The film The Curious Case of Benjamin Button, starring Brad Pitt, is based on a short story by whom?
Example Output: the curious case of benjamin button

Example Input: In which country did the dance The Czardas originate?
Example Output: csardas

Example Input: Which city in Egypt has been characterised as the 'world's greatest open air museum' and contains the ruins of the temple complexes at Karnak as well as monuments that include the Valley of the Kings and the Valley of the Queens?
Example Output:
karnak