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: Physiology
[{'content': 'In a patient with a transplanted hea which of these are the reasons for increased cardiac output during exercise: \nSelect and explain. \nA. Reinnervation of transplanted hea by vagus, B. Intrinsic mechanism, C. Epinephrine from medulla, D. Bainbridge reflex', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Epinephrine from medulla', 'role': 'assistant'}]