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
[{'content': 'CD4 count refers to ? \nSelect and explain. \nA. T helper cells, B. B cells, C. Cytotoxic cells, D. Both B And T Cells', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., T helper cells", 'role': 'assistant'}]