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

[EX Q]: The Bob Dylan songs 'Desolation Row', 'Tombstone Blues' and 'Like A Rolling Stone' featured on which album?
[EX A]: tombstone blues

[EX Q]: What is the official language of the Dominican Republic?
[EX A]: dominican republic

[EX Q]: Which actor played Dr Who between 1974 and 1980?
[EX A]:
doctor who