Xerophthalmia disease is caused by the deficiency of

Which of the following are reducing sugars?

I. Sucrose

III. Lactose

II. Ribose

IV. Fructose

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

Amino acids containing heterocyclic ring are

(i) Histidine

(ii) Valine

(iii) Arginine

(iv) Proline