<prompt> Which of the following is not a 2nd generation antihistamine?CetrizineCyclizineLoratidineFexofenadine  <response>: Ans. b. Cyclizine Ref: Katzung 11e p277Cyclizine is a first generation antihistaminics.Cetrizine, Loratidine and Fexofenadine are second generation antihistaminics.AntihistaminicsFirst GenerationSecond Generation Ethanolamines: Piperadine:- FexofenadineQ Miscellaneous:- LoratidineQ- CetrizineQ- Carbinoxamine- Diphenhydramine Piperazine:- Dimenhydrinate- Hydroxyzine- Meclizine Alkyiamines:- CyclizineQ- Bromopheniramine Phenothiazines:- Promethazine Miscellaneous:- Cyproheptadine- Chlorpheniramine 