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: A i.e. Chronic arsenic poisoning', 'role': 'assistant'}]