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

Ex Input:
In which US state would you find the cities of Chesapeake, Roanoke and Fredericksburg?

Ex Output:
fredericksburg


Ex Input:
Who composed the opera 'Albert Herring' in 1947?

Ex Output:
albert herring


Ex Input:
Which, chronologically, is the first of the Chronicles of Narnia, although it was the sixth of the series of books written by author C. S. Lewis?

Ex Output:

the chronicles of narnia