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: Radiology
Which of the following is most radiosensitive tumour? 
Select and explain. 
A. Astrocytoma, B. Medulloblastoma, C. Craniopharyngioma, D. Teratoma
B: Medulloblastoma
Answer: B: Medulloblastoma 
Explanation: Ans. Medulloblastoma