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

[Q]: Double vision, the perception of two images from a single object, is properly called what?
[A]: double vision

[Q]: Who plays Isobel Crawley in the UK television series 'Downton Abbey'?
[A]: downton abbey

[Q]: Afghanistan, Kazakhstan, Kyrgyzstan, Tajikistan and Turkmenistan all border which country?
[A]:
kyrgyzstan