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
[{'content': 'Yellow discoloration of skin and mucosa is seen in poisoning with: NEET 13 \nSelect and explain. \nA. Nitrous oxide, B. Nitric acid, C. Sulphuric acid, D. Phosphoric acid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Nitric acid', 'role': 'assistant'}]