This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Forensic Medicine
All of the following are inhibitors of cytochrome oxidase, except: COMEDK 07 
Select and explain. 
A. Carbon monoxide, B. Amytal, C. Cyanide, D. Azide
B: Amytal
Answer: B: Amytal 
Explanation: Ans. Amytal