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
Drug which can cause Hyperophic Pyloric stenosis is: 
Select and explain. 
A. Rifampicin, B. Erythromycin, C. Azithromycin, D. Ampicillin
B: Erythromycin
Answer: B: Erythromycin 
Explanation: Erythromycin