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

Q: Which actor spoke the line I love the smell of napalm in the morning* in the 1979 film Apocalypse Now?

A: apocalypse now
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Q: What are Proxima Centauri, Sirius A, Pollux, Arcturus and Betelgeuse?

A: arcturus
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Q: What is the collective name for the islands with a land area of 4,167 squ km (1,622 squ miles) over 2,500,000 squ km (965,255 squ miles) of ocean, made up of several groups of islands, including the Austral Islands, the Marquesas, the Society Islands and the Tuamotu Archipelago?

A:
marquesas islands
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