This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: New Born Infants, Subject name: Pediatrics
Most common cause of abdominal mass in neonates is? 
Select and explain. 
A. Neuroblastoma, B. Multicystic dysplastic kidney, C. Polycystic kidney, D. Umbilical hernia
B: Multicystic dysplastic kidney
Answer: B: Multicystic dysplastic kidney 
Explanation: b. Multicystic dyspiastic kidney(Ref: Nelson's 20/e p 2513)Multicystic dyspiastic kidneyQ is the most common cause of abdominal mass in a neonate.