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: Forensic Medicine
[{'content': "Magnan's phenomenon occurs in addiction with which of the following? \nSelect and explain. \nA. Alcohol, B. Cocaine, C. LSD, D. Opiates", 'role': 'user'}, {'content': "Answer: B \nExplanation: Magnan's sign is a feature of cocaine intoxication in which the intoxicated persons has the feeling of insects crawling under the skin. CNS manifestations of cocaine intoxication are: Ataxia Excitement Euphoria Garrulousness Headache Tremors Seizures Fever Hypehermia Mydriasis Stroke Central retinal aery occlusion Visual impairment Blurry vision Transient focal neurological deficits Toxic encephalopathy Coma Ref: Comprehensive Reviews in Toxicology: For Emergency Clinicians By Peter D Bryson page 500.", 'role': 'assistant'}]