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': 'Lithium \nSelect and explain. \nA. Delirium, B. Dementia, C. Schizophrenia, D. Depression', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Depression', 'role': 'assistant'}]