This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': 'The red velvety appearance of stomach mucosa is seen in the poisoning of \nSelect and explain. \nA. Lead, B. Arsenic, C. Copper, D. Mercury', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (Refer: Rajesh Bardale - Principle of Forensic Medicine & Toxicology, 1 st edition, pg no: 430)', 'role': 'assistant'}]