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
Formication is seen with 
Select and explain. 
A. Acute amphetamine intoxication, B. Chronic use of amphetamine, C. Alcohol withdrawal, D. Cannabis poisoning
B: Chronic use of amphetamine
Answer: B: Chronic use of amphetamine 
Explanation: 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.