This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
The normal ratio of CD4to CD8 is 
Select and explain. 
A. 1:01, B. 2:01, C. 8:01, D. 10:01
B: 2:01
Answer: B: 2:01 
Explanation: Ref Robbins 9/e p190-191 A normal CD4/CD8 ratio is 2.0, with CD4lymphocytes equal to or greater than 400/mm3 and CD8 lymphocytes equal to 200 to 800/mm3. If your ratio is higher than 2, it means your immune system is strong and you may not have HIV. If your ratio is less than 1, you may have: HIV.