instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which horse won the 2009 Epsom Derby?
answer:
2009 epsom derby

question:
Which composer's oratorios include 'The Kingdom' and 'The Dream of Gerontius'?
answer:
the dream of gerontius

question:
Which film musical starred Lee Marvin, Clint Eastwood and Jean Seberg?
answer:
lee marvin