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: Surgery
[{'content': "Spontaneous regression of malignant tumor is feature of - \nSelect and explain. \nA. Neuroblastoma, B. Renal cell carcinoma, C. Burkitt' s lymphoma, D. Wilm's tumour", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Neuroblastoma Both, Neuroblastoma and Renal cell carcinomas show spontaneous regression. But, the answer is Neuroblastoma because it has greater tendency to regress spontaneously than renal cell carcinoma.", 'role': 'assistant'}]