This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Histamine, 5-HT and PGs, Subject name: Pharmacology
Olopatidine acts as an:- 
Select and explain. 
A. Antihistaminic, B. Anti-inflammatory, C. Anti-emetic, D. Anti-psychotic
A: Antihistaminic
Answer: A: Antihistaminic 
Explanation: Olopatadine is a topical second generation anti-histaminic drugs It is used for allergic conjunctivitis as eye drops. ANTIHISTAMINIC DRUGS FIRST GENERATION SECOND GENERATION Promethazine Terfendaine (withdrawn now) Diphenhydramine Astemizole (withdrawan) Dimenhydrinate Fexofenadine Pheniramine Loratidine Chlorpheniramine Cetirizine Cinnarizine Levocetirizine Meclizine Mizolastine Cyclizine Azelastine Hydroxyzine Olopatadine Mepyramine Ebastine Buclizine Desloratidine