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

[EX Q]: The 1987 film 'Roxanne' was adapted by actor Steve Martin from which Edmond Rostand play?
[EX A]: roxanne

[EX Q]: 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?
[EX A]: incandescent light bulb

[EX Q]: Which legendary Greek hero killed the Minotaur with the help of Ariadne?
[EX A]:
ariadne