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

Which current Broadway musical has a Japanese therapist character called Christmas Eve?
christmas eve

In 2013 Yahoo purchased which pictures and video microblogging website business that was founded in 2007 in New York City by David Karp?
yahoo!

Which executive producer of Dream On is well known for films such as Trading Places?

dream on