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 examples of gastro-kinetic drugs except? 
Select and explain. 
A. Cisapride, B. Domperidone, C. Ampicillin, D. Erythromycin
C: Ampicillin
Answer: C: Ampicillin 
Explanation: Ans. is 'c' i.e., Ampicillin o Prokinetic drugs are --> Metoclopramide, Domperidone, Cisapride, Mosapride, Tegaserod, renzapride, prucalopride. About option 'd' Erythromycin has some gastrokinetic action ? "Erythromycin stimulates motilin receptors in the GIT, therapy induces gastric contractions, hastens gastric emptying and promotes intestinal motility". - KDT 6th/e p. 728.