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': 'Indications of ECT is/are -a) Psychotic depressionb) Catatonic schizophreniac) Cyclothymiad) Dysthymiae) Post traumatic stress disorder \nSelect and explain. \nA. ac, B. ab, C. ad, D. bc', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Severe depression with psychotic features (psychotic depression) and catatonic schizophrenia are indications for ECT.', 'role': 'assistant'}]