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
Which of the following test is sensitive for ketones in urine? 
Select and explain. 
A. Benedict test, B. Rothera's test, C. Nitroprusside tube test, D. All of the above
C: Nitroprusside tube test
Answer: C: Nitroprusside tube test 
Explanation: Nitroprusside tube test is also known as modified Rothera's test.