This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Medicine
In which leukemia, autoimmune hemolytic anemia is most common - 
Select and explain. 
A. ALL, B. AML, C. CML, D. CLL
D: CLL
Answer: D: CLL 
Explanation: <p>Autoimmune hemolytic anemia may occur as a complication of chronic lymphocytic leukemia.About 20% of cases of CLL develop a coomb&;s positive autoimmune hemolytic anemia.This is due to the presence of warm antibodies (Ig G) that coat RBC&;s that are reactive at room temperature .Red cells coated with Ig G along with C3 on its surface fuher promote red cell-leucocyte interaction ,accounting for more severe hemolysis.</p><p>Harsh mohan textbook of pathology sixth edition pg no 312.</p>