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
Phenobarbitone inhibits which complex of ETC? 
Select and explain. 
A. Complex I, B. Complex II, C. Complex III, D. Complex IV
A: Complex I
Answer: A: Complex I 
Explanation: Ans. A. Complex I(Ref: Harper 31/e page 123)Inhibitors of ETC at Complex I1. An insecticide and a fish Poison Rotenone2. Amobarbital which is a barbiturate.3. Piericidin