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: Surgery
[{'content': "A 10-month-old infant presents with acute intestinal obstruction. Contrast enema X-ray shows the intussusceptions, Likely cause is \nSelect and explain. \nA. Payers patch hypertrophy, B. Mekel's diverticulum, C. Mucosal polyp, D. Duplication cyst", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bailey writes - "The condition is encountered most commonly in children, in whom it occurs in an idiopathic form, with a peak incidence at 3-9 months. Between 70% and 90% of cases are classed as idiopathic, and an associated illness such as gastroenteritis or urinary tract infection is found in 30%. It is believed that hyperplasia of Peyer\'s patches in the terminal ileum may be the initiating event. This may occur secondary to weaning. In light of the seasonal variation, with a peak incidence in spring and summer, it may be related to upper respiratory tract infection pathogens such as adenovirus or rotavirus."\nIntussusception associated with a known pathologic lead point is seen in older children. The most common lead point is Meckel\'s diverticulum.\nThis patient is 10 months old, so most likely the cause should be hypertrophy of Peyer\'s patches.', 'role': 'assistant'}]