instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
What is the cathedral church of Rome?
answer:
cathedral


question:
In America, as what was Bill Shoemaker famous?
answer:
bill shoemaker


question:
Who stepped down as chief of 21st Century Fox in 2015?
answer:

21st century fox