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': 'Arsenic causes : \nSelect and explain. \nA. Rain drop pigmentation, B. Basal cell Ca, C. Alopecia, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Rain drop pigmentation', 'role': 'assistant'}]