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': 'Hirschsprung disease is confirmed by ? \nSelect and explain. \nA. Rectal biopsy, B. Per/Rectal examination, C. Rectal manometry, D. X-ray abdomen', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Rectal biopsyo Rectal suction biopsy is procedure of choice.", 'role': 'assistant'}]