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': "Which one of the following is the most common cause of abdominal mass in neonates – \nSelect and explain. \nA. Neuroblastoma, B. Wilm's tumour, C. Distended bladder, D. Multicystic dysplastic kidneys", 'role': 'user'}, {'content': 'Answer: D \nExplanation: "Multicystic dysplastic kidney is the most common cause of an abdominal mass in the newborn"\xa0\xa0- Nelson\n\nA most common abdominal mass is a neonate → Multicystic renal dysplasia.\nA Most common abdominal mass in 1 month to 3 years → Wilms a tumour or multicystic renal dysplasia.\nA most common renal problem in 3 to 6 years → Minimal change disease-causing nephrotic syndrome.\nA most common renal problem in 6 to 14 years → Acute post-streptococcal GN.', 'role': 'assistant'}]