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
The chemical used for qualitative and quantitative assessment of alcohol in the expired air is: KCET 12 
Select and explain. 
A. Aniline, B. Diphenylamine, C. Potassium ferrocyanide, D. Potassium dichromate
D: Potassium dichromate
Answer: D: Potassium dichromate 
Explanation: Ans. Potassium dichromate