This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastro Intestinal System, Subject name: Pediatrics
Projectile vomiting is a feature of: 
Select and explain. 
A. Esophageal atresia, B. Hypertrophic pyloric stenosis, C. Cholera, D. Intussusception
B: Hypertrophic pyloric stenosis
Answer: B: Hypertrophic pyloric stenosis 
Explanation: b. Hypertrophic pyloric stenosis(Ref: Nelson's 20/e p 1797-1799, Ghai 8/e p 279-280)Discussing the options one by onea. Esophageal atresiaFrothing & bubbling at mouth & nose & coughing, cyanosis, respiratory distress seenb. Hypertrophic pyloric stenosisProgressive non-bilious vomiting is the initial symptom of pyloric stenosisc. CholeraProfuse watery diarrhea, with profuse rice water stools with a fishy smell is seend. IntussusceptionSudden onset of severe paroxysmal colicky pain that is accompanied by straining efforts with legs and knees flexed. Vomiting occurs in most cases, but is not projectile.