This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
Norepinephrine is metabolized by which of the following enzymes 
Select and explain. 
A. COMT, B. MAO, C. Both, D. Neither
C: Both
Answer: C: Both 
Explanation: Both COMT and MAO breakdown norepinephrine. Ref:- KD Tripathi