This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
All are antiemetics except - 
Select and explain. 
A. Domperidone, B. Ondensetron, C. Phenazocine, D. Cyclizine
C: Phenazocine
Answer: C: Phenazocine 
Explanation: Ans. is `c' i.e., Phenazocine Antiemetic drugs 1. Anticholinergics --> Hyoscine, Dicyclomine. 2. H, antihistaminics --> Promethazine, cyclizine, Cinnarizine, etc. 3. Neuroleptics (D2 blockers) -* Chlorpromazine, Haloperidol, Droperidole etc. 4. Prokinetics drugs --> Metoclopramide, Domperidone, cisapride, Mosapride, Tegaserod. 5. 5-HT3 antagonists --> Ondansetron, Granisetron. Adjuvant antiemetics --> Dexamethasone, BZDs, Cannabinoids, Clonidine & ephedrine.