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': 'Which of the following anti - hypertensives was once used as an antipsychotic? \nSelect and explain. \nA. Atenolol, B. Propranolol, C. Clonidine, D. Reserpine', 'role': 'user'}, {'content': "Answer: D \nExplanation: Reserpine is an antihypertensive drug which was used as an antipsychotic. Antipsychotic effect of reserpine is due to depletion of 5 - HT or catecholamine or both.\nClonidine is also an antihypertensive. Its uses in psychiatry are - ADHD, opioid withdrawal, Tourette's syndrome and suppression of agitation in PTSD.", 'role': 'assistant'}]