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
Complex I of ETC is inhibited by - 
Select and explain. 
A. Amobarbital, B. Cyanide, C. 0, D. H2S
A: Amobarbital
Answer: A: Amobarbital 
Explanation: Ans. is 'a' i.e., Amobarbital Inhibitors of Electron transport chain (Respiratory chain)o Complex I:- Barbiturates (amobarbital), piercidin A, rotenone, chlorpromazine, guanithidine.o Complex II:- Carboxin, TTFA, malonate.o Complex III :- Dimercaprol, BAL, actinomycin A, Naphthyloquinone.o Complex IV :-(cytochrome c oxidase) Carbon monoxide (CO), cyanide (CN-), H2S, azide (N3 )