instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Established in 1919, which is the world's oldest surviving airline?
answer:
airline


question:
Which alliteratively-named politician served as Abraham Lincoln's Vice-President between 1861 and 1865?
answer:
abraham lincoln


question:
In a Dickens novel, who lived at Satis House?
answer:

charles dickens