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': '"Chasing the dragon" is a slang used with \nSelect and explain. \nA. Cocaine, B. Heroin, C. LSD, D. Ketamine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: "Chasing the dragon" refers to inhalation of vapours of Heroin (opioid) placed on a heated aluminium foil.', 'role': 'assistant'}]