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

Category: NOW THAT'S INVENTIVE! 
Clue: Famous for his jet, he also invented the automobile radio for the company that became Motorola
lear

Category: GEOGRAPHY "B" 
Clue: The Rhodope Mountains & the city of Sofia are in this country

bulgaria