Let’s describe antihistamines before answering the question

ANTIHISTAMINES: These drugs are used to treat allergy, e.g., skin rashes. Since the allergic reactions are caused due to liberation of histamine in the body, that is why these drugs are called antihistamines. These drugs are also called as anti-allergic drugs.

Options (i) Ranitidine and (iv) Cimetidine are the antihistamines, which are antacids as they prevent the interaction of histamine the receptors present in the stomach wall.

Options (ii) Brompheniramine and (iii) Terfenadine are only antihistamines.

Hence, options (i) and (iv) are correct. Options (ii) and (iii) are incorrect.