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 simplicity, answers should be in all lower cased letters.
PROBLEM: Category: WHAT'S COOKIN'? 
Clue: You can find this celebrity chef's pizzas at his Spago Restaurant, or frozen at the grocery store

SOLUTION: wolfgang puck

PROBLEM: Category: PARTICLE PHYSICS 
Clue: To get an element's mass number, add its protons & these

SOLUTION: neutrons

PROBLEM: Category: OOPS! 
Clue: An outcry led the Post Office to reconsider issuing a 1995 stamp showing this WWII event

SOLUTION:
dropping the a-bomb on hiroshima