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.

[EX Q]: Category: ART & ARTISTS 
Clue: An X-ray of his "Blue Boy" has revealed the figure of a small dog that was painted out
[EX A]: thomas gainsborough

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

[EX Q]: Category: THE PLANETS 
Clue: Most of this planet's moons are named for Shakespearean characters
[EX A]:
uranus