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: Biochemistry
Rothera's test for detection of 
Select and explain. 
A. Proteins, B. Glucose, C. Fatty acid, D. Ketones
D: Ketones
Answer: D: Ketones 
Explanation: Ketones

Rothera's nitroprusside - pink/purple permanganate ring test and Gerhard's - ferric chloride - red wine color tests are used for detection of ketone bodies in urine.