You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

[Q]: Category: SCIENCE 
Clue: This yellow element is found in gunpowder & matches & is used in vulcanizing rubber
[A]: sulphur


[Q]: Category: ASTRONOMY 
Clue: A galactic cloud of dust & gas, its name comes from the Latin for "cloud"
[A]: nebula


[Q]: Category: ICELAND COMETH 
Clue: Located in Faxa Bay, it was made the capital of Iceland in 1918
[A]:
reykjavik