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': 'Sweat glands are supplied by only: \nSelect and explain. \nA. Parasympathetic nerves, B. Sympathetic nerves, C. Sensory nerves, D. Motor nerves', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]