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': 'Hipper a sign that demonstrate alternative contraction and dilation of puils is seen in which poisoning? \nSelect and explain. \nA. Cannabis poisoning, B. Aconite poisoning, C. Nicotine poisoning, D. Amphetamine overdose', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hipper is a classical sign of Aconite\xa0poisoning.', 'role': 'assistant'}]