instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which film director won the Oscar for Best Picture for the film 12 Years a Slave in 2013?
answer:
12 years a slave


question:
Where is David Cameron's Oxfordshire constituency?
answer:
david cameron


question:
In which capital city did the assassination of Archduke Franz Ferdinand trigger World War I?
answer:

archduke franz ferdinand of austria