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: Pathology
Most common leukemia in down syndrome? 
Select and explain. 
A. AMC, B. ALL, C. CLL, D. CML
B: ALL
Answer: B: ALL 
Explanation: Acute lymphoblastic leukemia is the most common leukemia in patients with down syndrome.