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: Medicine
[{'content': "Which of the following maliganat diseases of children has the best prognosis ? \nSelect and explain. \nA. Wilm's tumour, B. Neuroblastoma, C. Khabdomyosarcoma, D. Primitive neuroectodermal tumour", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]