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
CLL is characterised by: 
Select and explain. 
A. Small lymphocytes in peripheral smear, B. Seen commonly in age>50 yrs persons, C. Hepato splenomegaly seen, D. All the above
D: All the above
Answer: D: All the above 
Explanation: All the above