This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
Which drug predisposes to pyloric stenosis in infants - 
Select and explain. 
A. Erythromycin, B. Streptomycin, C. Tetracycline, D. Nitrofurantoin
A: Erythromycin
Answer: A: Erythromycin 
Explanation: Ans. is 'a' i.e., Erythromycino Maternal and infant use of erythromycin and other macrolide antibiotics have been reported as riks factors for infantile hypertrophic pyloric stenosis (IHPS).