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

Q: 'Dookie' and '21st. Century Breakdown' are albums by which American rock band?

A: 21st century breakdown
****
Q: What is the cathedral church of Rome?

A: cathedral
****
Q: The sales and reputation of what cheese were affected when toxins were believed to have contaminated buffalo milk?

A:
cheese
****