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

In 1959, for which film did David Niven win his only Academy Award?
david niven

The Church of the Savior on Spilled Blood, built on the site of the assassination of Tsar Alexander II, is in which Russian city?
church of the savior on blood

Who is the engineer and inventor of the noise reduction system known as Dolby NR and a co-inventor of video tape recording while at Ampex?

dolby noise-reduction system