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
Which of the following is true about medulloblastomaa) Radiosensitive tumorb) Spreads through CSFc) Surgical Rx not doned) Occurs in young age groupe) It is a supratentorial tumor 
Select and explain. 
A. acd, B. abd, C. abc, D. ab
B: abd
Answer: B: abd 
Explanation: Medulloblastoma 

Its a primitive-neuroectodermal tumor (P-NET)
Age

-     primarily childhood tumor
-     its the most common primary brain tumor in children (Ref Sabiston 17/e, p 2145]

Location
infratentorial
most common site is yentas (75%) (most common site in adults is lateral cerebellar hemisphere)
Medulloblastomas tend to metastasize early, widely and massively throughout the CSF.
Treatment consists of surgical resection followed by radiation therapy.
Medulloblastoma is moderately radiosensitive.