This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory Chain, Subject name: Biochemistry
Which is inhibitor to cytochrome oxidase? 
Select and explain. 
A. Malonate, B. BAL, C. Oligomycin, D. Cyanide
D: Cyanide
Answer: D: Cyanide 
Explanation: Ans. is 'd' i.e., Cyanide Inhibitors of Electron transport chain (Respiratory chain)o Complex I:- Barbiturates (amobarbital), piercidin A, rotenone, chlorpromazine, guanithidine.o Complex II:- Carboxim TTFA, malonate.o Complex III :- Dimercapro!, BAL. actinomycinA, Naphthyloquinone.o Complex IV(cytochrome c oxidase) Carbon monoxide (CO), cyanide (CN-), H2S, azide (N3-)