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': 'Sin needle used to kill animals made of : \nSelect and explain. \nA. Dhatura seeds, B. Rati seeds, C. Lead peroxide, D. Arsenic', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Rati seeds', 'role': 'assistant'}]