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: Social & Preventive Medicine
Test to detect contamination of mustard oil with argemone oil? 
Select and explain. 
A. Sulphuric acid test, B. Nitric acid test, C. Chromic acid test, D. All of the above
B: Nitric acid test
Answer: B: Nitric acid test 
Explanation: None