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
CHALCOSIS is due to the deposition of which metal in tissue? 
Select and explain. 
A. Arsenic, B. Copper, C. Mercury, D. Lead
B: Copper
Answer: B: Copper 
Explanation: The presence of copper deposits in the tissues is called chalcosis. It is due to the chronic poisoning by copper. Copper may be deposited in the cornea resulting in a pigmented ring in the deeper layers. It may occur in workers with the metal due to inhalation of dust or from food being contaminated with verdigris. Ref: The Essentials of Forensic Medicine and Toxicology 29th Ed Page 491.