This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Forensic Medicine
[{'content': 'Verdigris is \nSelect and explain. \nA. Copper sulphate, B. Copper arsenite, C. Copper acetoarsenite, D. Copper subacetate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Copper is not poisonous in the metallic state, but some of its salts are poisonous. The two most commonly known salts are copper sulphate or blue vitriol and the subacetate or verdigris.Copper subacetate is a bluish green salt formed by the action of vegetable acids on copper cooking vessels that are not properly tinned.Krishan Vij textbook of forensic medicine and toxicology 5e pg: 569', 'role': 'assistant'}]