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
In which of the following types of leukemia is methotrexate administered for CNS prophylaxis - 
Select and explain. 
A. ALL, B. AML, C. CLL, D. CML
A: ALL
Answer: A: ALL 
Explanation: None