instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
The film The Curious Case of Benjamin Button, starring Brad Pitt, is based on a short story by whom?
answer:
the curious case of benjamin button


question:
Which group had a top ten hit with 'Driving in My Car' in 1982?
answer:
driving in my car


question:
Octavian who became Augustus, and Lepidus were two of the 'Second Triumvirate' in 43BC. Who was the third?
answer:

marcus aemilius lepidus