This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Forensic Medicine
[{'content': "A middle aged man presents with paraesthesia of hand and feet. Examination reveals presence of 'Mees' lines in the nails and rain drop pigmentation in the hands; The most likely causative toxin for the above mentioned symptoms is : \nSelect and explain. \nA. Lead, B. Arsenic, C. Thallium, D. Mercury", 'role': 'user'}, {'content': "Answer: B \nExplanation: 'Mees' lines in the nails and rain drop pigmentation of skin are characteristic of arsenic poisoning. Treatment of choice - freshly precipitated hydrated ferric chloride. Reference The Synopsis of FORENSIC MEDICINE and Toxicology 29th Edition", 'role': 'assistant'}]