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': "The most common malignant neoplasm of infancy is: \nSelect and explain. \nA. Malignant teratoma, B. Neuroblastoma, C. Wilms' tumor, D. Hepatoblastoma", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Neuroblastoma accounts for 7-10% of pediatric malignancies and is the most common solid neoplasm outside the CNS. Fifty percent of neuroblastomas are diagnosed before age 2 years and 90% before age 5 years. Ref: Kligman, Behrman, Jenson, Stanton (2008), Chapter 498, "Neuroblastoma", In the book, "Nelson\'s Textbook of Pediatrics", Volume 2, 18th Edition, New Delhi, Page 2137', 'role': 'assistant'}]