TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Chep Lap Kok airport is located where?

SOLUTION: hong kong international airport

PROBLEM: In which shipping forecast area are the Channel Islands?

SOLUTION: channel islands

PROBLEM: Who was the father of Edward the Elder, the Anglo-Saxon King from 899 to 924?

SOLUTION:
edward the elder