TASK DEFINITION: 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.
PROBLEM: Category: SHAKESPEARE IN LOVE 
Clue: Jessica states that "love is blind" as she elopes (with dad Shylock's ducats) in this comedy

SOLUTION: the merchant of venice

PROBLEM: Category: "PH" DELIGHTS 
Clue: Appropriately, Paul Nurse shared the 2001 Nobel Prize in this category

SOLUTION: physiology

PROBLEM: Category: COLORS 
Clue: Yeats wrote, "When you are old and" this color "and full of sleep and nodding by the fire..."

SOLUTION:
gray