This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Corrosive Poisons, Subject name: Forensic Medicine
[{'content': 'Yellow discoloration of the skin and the mucosa is seen in which poisoning? \nSelect and explain. \nA. Nitrous oxide, B. Nitric acid, C. Sulphuric acid, D. Phosphoric acid', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Nitric acid o Nitric acid causes yellow discoloration of the tissues including the crowns of the teeth & yellow stains on the clothing,o Inhalation of fumes causes lacrimation, photophobia, irritation of air-passages & lungs producing sneezing, coughing, dyspnea & asphyxia,o The color of urine is brown.PoisonPattern of MucosaArsenicRed velvety mucosa of the stomachH2SO4Brown of Black with erosion, perforation & CarbolizationCarbolic AcidGreen w hite of Brow n - white or Grey leathery- and thickened mucosaHNO3YellowHC1PinkAmmoniaPerforatedHCNPinkKCNBrick red to brownKOH, NaOHDeeply congested. BlackPhosphorusYellow or grey white", 'role': 'assistant'}]