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
The commonest cause of intestinal obstruction and abdominal pain in children between 3 months to 6 years of age: 
Select and explain. 
A. Intussusception, B. Meckel's diverticulum, C. Intestinal polyp, D. Nonspecific cause
A: Intussusception
Answer: A: Intussusception 
Explanation: Ans. A. IntussusceptionIntussusception occurs when a portion of the alimentary tract is telescoped into an adjacent segment. It is the most common cause of intestinal obstruction between 3 month and 6 yr. of age.