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': 'All of the following are NREM sleep disorders except \nSelect and explain. \nA. Somnambulism, B. Pavor nocturnus, C. Nightmares, D. Somniloquy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]