Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
--------
Question: Responsible for such films as 'Saving Private Ryan' and 'Gladiator', which film Production Company was founded by Steven Spielberg, Jeffrey Katzenberg and David Geffen in 1994?

Answer: saving private ryan


Question: Which of these was the title of Bobby Darin's first million selling single?

Answer: bobby darin


Question: What did Bardeen, Shockley and Brattain invent in 1947, and for which they were awarded the Nobel Prize for Physics in 1956?

Answer:
walter houser brattain