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': 'Treatment of choice for endogenous depression with suicidal tendency - \nSelect and explain. \nA. Lithium, B. Chlorpromazine, C. ECT, D. Psychoanalysis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]