Amongst the following antihistamines, which are antacids?

The correct options are
A Ranitidine
D Cimetidine

Antihistamines are drugs that inhibit the action of histamine in the body by blocking the receptors of histamine. There are two types of histamine receptors $H_1$ and $H_2$. Ranitidine is in a group of drugs called histamine-2 blockers.

Ranitidine works by reducing the amount of acid your stomach produces.

Brompheniramine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose.It is used to treat runny nose, sneezing, itching, and watery eyes caused by allergies, the common cold, or the flu.

Terfenadine is an antihistamine. Antihistamines prevent sneezing, runny nose, itching and watering of the eyes, and other allergic symptoms.It is used to treat allergies, hives (urticaria), and other allergic inflammatory conditions.

Cimetidine is an antihistamine antihistamine used for treating and preventing heartburn from acid indigestion or sour stomach.

It may also be used to treat other conditions as determined by your doctor.

So Ranitidine and Cimetidine are antihistamine antacids.

Hence, options A & D are correct.