This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Carbohydrates, Subject name: Biochemistry
Seliwanoff's test is positive in: 
Select and explain. 
A. Glucose, B. Fructose, C. Galactose, D. Mannose
B: Fructose
Answer: B: Fructose 
Explanation: Ans. B. FructoseSeliwanoff's test is a specific test for ketohexoses. It consists of resorcinol with HCL. It reacts with ketoses forming furfurals and then condenses to form a cherry colored complex. Given by fructose, sucrose.