This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Biochemistry
[{'content': 'inhibitor of NADG-COQ reductase in electron transpo chain \nSelect and explain. \nA. rotenone, B. phenoformin, C. carbomonoxide, D. malonate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: complex- nadh-coq reductase inhibited by = rotenone,phenobarbitone complex 2= malonate inhibits complex 3 = phenofromin complex 4 = cyt c oxidase inhibited by = CO/CN/H2S ref : lipincott 9th ed', 'role': 'assistant'}]