This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics And Genetic Disorders, Subject name: Pediatrics
Commonest cause of intestinal obstruction in Down syndrome is: 
Select and explain. 
A. Colonic atresia, B. Intestinal atresia, C. Duodenal atresia, D. Esophageal atresia
C: Duodenal atresia
Answer: C: Duodenal atresia 
Explanation: c. Duodenal atresia(Ref: Nelson's 20/e p 610-615, Ghai 8/e p 637-639)Most common cause of Intestinal obstruction in Down's syndrome is duodenal atresia.