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': 'ECT is useful in \nSelect and explain. \nA. Mania (Acute), B. Chronic Schizophrenia, C. Acute Depression, D. Pannic Disorder', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Acute depression', 'role': 'assistant'}]