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
CD4 count refers to ? 
Select and explain. 
A. T helper cells, B. B cells, C. Cytotoxic cells, D. Both B And T Cells
A: T helper cells
Answer: A: T helper cells 
Explanation: Ans. is 'a' i.e., T helper cells