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
Formication is seen with ? 
Select and explain. 
A. Acute amphetamine intoxication, B. Chronic use of amhetamine, C. Alcohol withdrawal, D. Cannabis poisoning
B: Chronic use of amhetamine
Answer: B: Chronic use of amhetamine 
Explanation: Ans. B. Chronic use of amhetamineMagnan's syndrome (also called formication) is seen in chronic cocaine and chronic amphetamine abuse.