TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: And Another Thing... by Eoin Colfer, published in 2009, eight years after the death of the author of the first five, is described as the sixth in which trilogy of books?

SOLUTION: and another thing...

PROBLEM: Which biologist was known as Darwin's Bulldog?

SOLUTION: charles darwin

PROBLEM: Joanna Lumley and David McCallum played which pair in a TV series?

SOLUTION:
joanna lumley