This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Childhood Tumors, Subject name: Pediatrics
Which of the following is the most common malignant tumor of infancy? 
Select and explain. 
A. Neuroblastoma, B. Wilm's tumor, C. Polycystic kidney disease, D. Renal cell carcinoma
A: Neuroblastoma
Answer: A: Neuroblastoma 
Explanation: a. Neuroblastoma(Ref: Nelson's 20/e p 2417, Ghai 8/e 616)Both Neuroblastoma & Wilms' tumor can present as a solid abdominal mass with calcifications.As the child in the given question is an infant, Neuroblastoma is the best answer.