What is hyperglycemia?

Lactose on hydrolysis gives

Assertion: Glucose and fructose give the same osazone.
Reason: During osazone formation,stereochemistry only at $C_1$ and $C_2$ is destroyed.

Glucose $\xrightarrow{Br_2 - H_2O}$ Product; Product is

$D$-Glucose and $L$-Glucose are

$A$ polysaccharide '$X$' on boiling with dil $H_2SO_4$ at $393 \ K$ under $2-3 \ atm$ pressure yields '$Y$'. '$Y$' on treatment with bromine water gives gluconic acid. '$X$' contains $\beta-$glycosidic linkages only. Compound '$X$' is ..... .