instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
What's missing: Magnum Force, The Enforcer, Sudden Impact, and The Dead Pool?
answer:
sudden impact

question:
Which band had a hit with the song 'Brown Girl in the Ring'?
answer:
brown girl in the ring

question:
Which Scottish civil engineer was responsible for building the Caledonian Canal?
answer:
civil engineer