Match List - I with List - II.

List-I	List-II
(a) Valium	(i) Antifertility drug
(b) Morphine	(ii) Pernicious anaemia
(c) Norethindrone	(iii) Analgesic
(d) Vitamin B$$_{12}$$	(iv) Tranquilizer

Choose the correct answer from the options given below:

We need to match each drug/vitamin with its correct classification or use.

Valium (diazepam) is a well-known tranquilizer used to treat anxiety, insomnia, and seizures. So (a) matches with (iv).

Morphine is a powerful analgesic (pain reliever) derived from opium. It is used to relieve severe pain. So (b) matches with (iii).

Norethindrone is a synthetic progesterone and is used as an antifertility drug (oral contraceptive). So (c) matches with (i).

Vitamin $$B_{12}$$ (cyanocobalamin) deficiency causes pernicious anaemia, a condition in which the body cannot produce enough healthy red blood cells. So (d) matches with (ii).

Therefore, the correct matching is: (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii).

The correct answer is Option (4).