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': "The skeletal muscles become more excitable even to a mild stimulus is known as: \nSelect and explain. \nA. Trousseau's sign., B. Chvostek's sign., C. Erb sign., D. None", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]