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

With which song did Swedish pop group Abba win the 1974 Eurovision Song Contest?
abba

In the order of the British Empire, what does the letter `C` stand for in CBE?

order of the british empire