This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
[{'content': 'Normal % of CD4 cells in a newborn - \nSelect and explain. \nA. 35% of T cells, B. 45% of T cells, C. 55% of T cells, D. 65% of T cells', 'role': 'user'}, {'content': 'Answer: A \nExplanation: If your test repos CD4% = 34%, that means that 34% of your lymphocytes were CD4 cells. This percentage is more stable than the number of CD4 cells. The average normal CD4% for HIV negative is about 40%. Reff: www.mayoclinic.com', 'role': 'assistant'}]