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

[EX Q]: Which form of dementia is named after a German psychiatrist who first described it in 1906?
[EX A]: dementia

[EX Q]: The Byzantine Empire is the term used since the 19th century to describe the Roman Empire of the Middle Ages, centred on its capital, where?
[EX A]: byzantine empire

[EX Q]: Who wrote the major choral work 'All Night Vigil', better known as the 'Vespers' which was sung at his funeral in 1943?
[EX A]:
vespers