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.

Category: __E__E__E 
Clue: A form of address for some royalty, it means calm & unruffled
serene

Category: A DELICATE OPERATION 
Clue: A bypass operation may bypass the carotid or coronary one of these
artery

Category: BACK TO '80s TV 
Clue: In the '80s he was a staple of "Wrestlemania"; he "Knows Best", according to the 2005 reality show about him

hulk hogan