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': '“Smack” is the “common” name for \nSelect and explain. \nA. Heroin, B. Cocaine, C. Opium, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Heroin or di-acetyl-morphine is about two times more potent than morphine in injectable form. Apart from the parenteral mode of administration,\nheroin can also be smoked or ‘chased’ ( chasing the dragon), often in an impure form (called ‘ smack’ or ‘ brown sugar’ in India). \nHeroin is more addicting than morphine and can cause dependence even after a short period of exposure.', 'role': 'assistant'}]