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
Mycosis fungoides affects - 
Select and explain. 
A. T Cells, B. B Cells, C. NK Cells, D. K Cells
A: T Cells
Answer: A: T Cells 
Explanation: The histological hallmark of the mycosis fungoides is the presence of the Sezary-Lutzner cells. These are CD4 helper T cells.