Solution:
Cimetidine is an antacid which is used to treat acidity and uneasiness in stomach.
Alitame is an example of an Artificial sweetener.
Novestrol is a birth controlling pill, therefore fall under the class of antifertility drug.
Valium is a tranquilizer as it is used to treat stress and anxiety.
The correct match is:
(A)-(II), (B)-(IV), (C)-(I), (D)-(III)