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
The type of lymphocyte which is predominent in chronic lymphatic leukemia - 
Select and explain. 
A. T lymphocyte, B. B lymphocyte, C. K cells, D. Helper T lymphocyte
B: B lymphocyte
Answer: B: B lymphocyte 
Explanation: None