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: Biochemistry
[{'content': 'In vivo control of citric acid cycle is effected by: \nSelect and explain. \nA. Acetyl CoA, B. Coenzyme A, C. ATP, D. Citrate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. ATP, E i.e. NADH', 'role': 'assistant'}]