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: Psychiatry
[{'content': 'Mutism and akinesis in a person who appears awake and even alerts is best described as \nSelect and explain. \nA. Twilight state, B. Stupor, C. Oneroid state, D. Delirium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Stupor : Akinesis (no movement) with mutism but with evidence of relative preservation of conscious awareness.', 'role': 'assistant'}]