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
Which of the following drugs acts on "motilin" receptors- 
Select and explain. 
A. Erythromycin, B. Tetracycline, C. Norfloxacin, D. Chloramphenicol
A: Erythromycin
Answer: A: Erythromycin 
Explanation: Ans. is 'a' i.e., Erythromycin o Erythromycin stimulates motilin receptors in the GIT-thereby, induces gastric contractions, hastens gastric emptying and promotes intestinal motility.