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': 'Resting membrane potential in cardiac muscle ? \nSelect and explain. \nA. -70 mV, B. +70 mV, C. -90 mV, D. +90 mV', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., -90 mVNormal RMP in myocardial fibers is about -90 mV.", 'role': 'assistant'}]