This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Forensic Toxicology - Concepts, Statutes, Evidence, and Techniques, Subject name: Forensic Medicine
[{'content': 'The metal responsible for this disease is: \nSelect and explain. \nA. Mercury, B. Lead, C. Arsenic, D. Copper', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (A). MercuryAcrodynia (pink disease, erythroedema, or swift- feer's disease)Due to idiosyncratic reaction to mercury among childrenMaculopapular rash (fingertips, toes)Pus-filled skin eruptionsSwollen and painful extremities", 'role': 'assistant'}]