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
Hyperpigmentation of palms & soles is seen in which poisoning 
Select and explain. 
A. Arsenic, B. Mercury, C. Lead, D. Copper
A: Arsenic
Answer: A: Arsenic 
Explanation: A i.e. Arsenic