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: PALINDROMING 
Clue: Epic Norse narratives
sagas

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

Category: FILE UNDER "T" 
Clue: He was sent to bring Isolde to Cornwall to marry his uncle, King Mark

tristan