There are three disaccharides A, B and C. The hydrolysis products of 'A'are functional isomers and of 'B'are epimers. But the hydrolysis products of 'C' are neither epimers nor functional isomers. Then what are A, B and C? 

Explanation

Disaccharide .A. is sucrose. It gives glucose and fructose upon hydrolysis. Disaccharide .B. is Lactose. It gives glucose and galactose upon hydrolysis. .C. is maltose. It gives two glucose molecules upon hydrolysis.