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

Example Input: What was the title of Britney Spears' second album (and the single that was released from it)?
Example Output: britney spears

Example Input: In May 1940, who became British Prime Minister after the resignation of Neville Chamberlain?
Example Output: prime minister of the united kingdom

Example Input: The Bob Dylan songs 'Desolation Row', 'Tombstone Blues' and 'Like A Rolling Stone' featured on which album?
Example Output:
tombstone blues