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.

Category: SCIENCE "T"ALK 
Clue: It's what the "t" stands for in tRNA
transfer

Category: QUESTIONABLE SONGS 
Clue: The song that says, "Turn around & you're 2, turn around & you're 4" opens with this question
where are you going?

Category: MUSIC 
Clue: The D'Oyly Carte Opera Company was founded to perform the works of this British duo

gilbert & sullivan