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

On January 26, 1879, who was granted a patent for r an electric lamp using a carbon filament or strip coiled and connected to platina contact wires?
incandescent light bulb

Which British TV star and disc jockey said `It`s not affected my work - how healthy do you have to be to play Da Do Ron Ron` in 1992 after confirming he had AIDS?
hiv/aids

Who was Minister-Chairman of the Russian Provisional Government and Prime Minister of Russia from 21 July 1917 (following the abdication of Tsar Nicholas II) to 8 November 1917 (the Bolshevik revolution), who is buried in Putney Vale Cemetery, London?

russian revolution