Considering the facts that

I. sucrose forms glycosidic linkage between $\mathrm{C}_1$ of glucose and $\mathrm{C}_2$ fructose, while

II. lactose forms glycosidic linkage between $\mathrm{C}_1$ of galactose and $\mathrm{C}_4$ of glucose.

Choose the correct statement.

Xerophthalmia disease is caused by the deficiency of

Which of the following are reducing sugars?

I. Sucrose

III. Lactose

II. Ribose

IV. Fructose

$$ \text { Choose the correct Zwitter ionic form for aspartic acid. } $$