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

Ex Input:
Austin is the state capitol of which US State?

Ex Output:
austin, texas


Ex Input:
Who wrote `20,000 Leagues Under The Sea`?

Ex Output:
20,000 leagues under the sea


Ex Input:
The assassination of which Austrian royalty precipitated World War I?

Ex Output:

assassination of archduke franz ferdinand of austria