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 SHOULD I "DU"? 
Clue: A philosophical system that seeks to explain all phenomena in terms of 2 distinct principles

SOLUTION: dualism

PROBLEM: Category: MEDICINE 
Clue: Robert Koch, in 1876, was the first to identify the bacterium causing a specific disease, this disease of cattle & man

SOLUTION: anthrax

PROBLEM: Category: TV SPIN-OFFS 
Clue: Dick Van Dyke's character of Dr. Mark Sloan on this series was introduced on "Jake and the Fatman"

SOLUTION:
diagnosis murder