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 consistency, answers should be in all lower cased letters.

Category: THE RUSSIANS ARE COMING 
Clue: On April 14, 1961 this cosmonaut was awarded the honor "Hero of the Soviet Union"
gagarin

Category: OPENING LINES OF SHAKESPEARE 
Clue: "Now is the winter of our discontent made glorious summer by this sun of York"
richard iii

Category: TONGUE TWISTERS 
Clue: It's what "Peter Piper picked a peck of"

pickled peppers