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

[EX Q]: What was Paul McCartney's first solo album called?
[EX A]: album

[EX Q]: Seymour is the family name of which English duke?
[EX A]: duke

[EX Q]: The Angostura Bridge crosses the Orinoco River in which country?
[EX A]:
angostura bridge