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

Established in 1919, which is the world's oldest surviving airline?
airline

Who achieved fame for his ,'Confessions Of An English Opium Eater'?
confessions of an english opium-eater

Which film star did Martin Landau play in the 1994 film 'Ed Wood'?
ed wood