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: Physiology
Normal CD4 cell count is: 
Select and explain. 
A. 500/cu.mm, B. 1000/cu.mm, C. 200/cu.mm, D. 700/cu.mm
B: 1000/cu.mm
Answer: B: 1000/cu.mm 
Explanation: None