This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Substance abuse, Subject name: Psychiatry
[{'content': 'Formication is seen with \nSelect and explain. \nA. Acute amphetamine intoxication, B. Chronic use of amphetamine, C. Alcohol withdrawal, D. Cannabis poisoning', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Tactile hallucinations (formication), in clear consciousness, may sometimes occur in chronic amphetamine intoxication. Ref: Sho textbook of Psychiatry by Niraj Ahuja, 7th edition, page 49.', 'role': 'assistant'}]