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 tumour is seen in - \nSelect and explain. \nA. Burkits lymphoma, B. Neuroblastoma, C. Wilm's tumour, D. All", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Neuroblastoma Also in Retinoblastoma, malignant melanoma, choriocarcinoma", 'role': 'assistant'}]