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: Pediatrics
[{'content': "Commonest cause of intestinal obstruction in down's syndrome – a) Colomic atresia b)  Intestinal atresiac) Duodenal atresia d)  Oesophageal atresia \nSelect and explain. \nA. a, B. bc, C. ac, D. ad", 'role': 'user'}, {'content': "Answer: B \nExplanation: Most common cause of Intestinal obstruction in Down's syndrome is duodenal atresia.\nDuodenal atresia is a type of intestinal atresia.", 'role': 'assistant'}]