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

Will you still be sending me a valentine is a line from which Beatles song?
the beatles

In the film 'Breakfast at Tiffanys', what is the name of Audrey Hepburn's character's cat ?
breakfast at tiffany's

July 17, 1890 marked the death of what Scottish moral philosopher, considered the father of modern economics, who wrote such classics as An Inquiry into the Nature and Causes of the Wealth of Nations and The Theory of Moral Sentiments?
the wealth of nations