This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Ophthalmology
[{'content': 'In an exhumed body which of the following poisons can be detected in bones \nSelect and explain. \nA. lead, B. Arsenic, C. Mercury, D. cadmium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ref : ak khurana 7th ed', 'role': 'assistant'}]