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

Which evolutionary biologist wrote The Ancestor's Tale in 2004?
the ancestor's tale

In 2013 Yahoo purchased which pictures and video microblogging website business that was founded in 2007 in New York City by David Karp?
yahoo!

Named after the Greek words for good and sound, what is the valved brass tenor instrument resembling a small tuba?
brass instrument