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: THE "I"s HAVE IT 
Clue: Style of the 1877 painting seen here
[EX A]: impressionism

[EX Q]: Category: THE U.S. SENATE 
Clue: Generally the Senate ends the day by doing this, rather than adjourning
[EX A]: recessing

[EX Q]: Category: THE STARS 
Clue: Every second the sun converts about 4 million tons of this into helium
[EX A]:
hydrogen