This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chronic Lymphocytic Leukemia, Subject name: Pathology
One of the following leukemia almost never develops after radiation? 
Select and explain. 
A. Acute myeloblastic leukemia, B. Chronic myeloid leukemia, C. Acute lymphoblastic leukemia, D. Chronic lymphocytic leukemia
D: Chronic lymphocytic leukemia
Answer: D: Chronic lymphocytic leukemia 
Explanation: Radiation is not an etiological factor for CLL.