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

[EX Q]: Who was the father of Edward the Elder, the Anglo-Saxon King from 899 to 924?
[EX A]: edward the elder

[EX Q]: Who has taken over the TV role of Doctor Who, from actor David Tennant?
[EX A]: doctor who

[EX Q]: Adam Clayton is a long-serving member of which band?
[EX A]:
adam clayton