This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Substance Related and Addictive Disorders, Subject name: Psychiatry
[{'content': 'Magnan phenomenon is associated with which of the following drug use? \nSelect and explain. \nA. Cocaine, B. Cannabis, C. Alcohol, D. Tobacco', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Magnan phenomenon is another name for cocaine bugs, which are tactile hallucinations where in a patient who is intoxicated with cocaine feels as if small insects are crawling under the skin Cocaine Bugs It occurs as a pa of cocaine induced psychotic disorder Here the patient will have sensations of bugs crawling beneath the skin which is known as formication', 'role': 'assistant'}]