This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
[{'content': 'Non-bilious vomiting seen in \nSelect and explain. \nA. Meconium ileus, B. Duodenal atresia, C. Hyperophic pyloric stenosis, D. Necrotising enterocolitis', 'role': 'user'}, {'content': "Answer: C \nExplanation: Vomiting in infancyBile-stainedIntestinal malrotation with volvulus Duodenal atresia/stenosis ( is usually just distal to the ampulla of Vater)Jejunal/ileal atresia (often isolated anomalies)Hirschsprung's diseaseAnorectal malformationsMeconium ileus (cystic fibrosis)Necrotising enterocolitisIncarcerated inguinal herniaIntussusception (often non-bilious initially)Non-bilious Infantile hyperophic pyloric stenosisGastro-oesophageal refluxFeeding difficulties (technique/volume)Non-specific marker of illness, e.g. infectionRef: Bailey and Love 27e pg: 128", 'role': 'assistant'}]