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': 'The chemical used for qualitative and quantitative assessment of alcohol in the expired air is: KCET 12 \nSelect and explain. \nA. Aniline, B. Diphenylamine, C. Potassium ferrocyanide, D. Potassium dichromate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Potassium dichromate', 'role': 'assistant'}]