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

[Q]: In 1867 who became the first Prime Minister of Canada?
[A]: prime minister of canada

[Q]: Eddie Jones was appointed head coach of which English sporting team in 2015?
[A]: eddie jones

[Q]: What is the dam in the Black Canyon of the Colorado River on the border between the US states of Arizona and Nevada that was completed in 1935?
[A]:
black canyon of the colorado