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': 'Physical withdrawl symptoms are absent in patients abusing \nSelect and explain. \nA. Alcohol, B. Cannabis, C. Opium, D. Pethidine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Cannabis', 'role': 'assistant'}]