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
[{'content': "The commonest cause of intestinal obstruction and abdominal pain in children between 3 months to 6 years of age: \nSelect and explain. \nA. Intussusception, B. Meckel's diverticulum, C. Intestinal polyp, D. Nonspecific cause", 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]