In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.

Who invented the first curling iron in 1872?
Francois Marcel Grateau

How much money does tourism bring to canada?
$17.4 billion

Who won in floyd mayweather vs conor mcgregor?

Floyd Mayweather