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': 'A 30 year old male from West Bengal presents to you with hyperkeratosis, and transverse nail lines, Most likely cause is - \nSelect and explain. \nA. Chronic arsenic poisoning, B. Chronic lead poisoning, C. Chronic mercury poisoning, D. Acute arsenic poisoning', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]