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: Medicine
Flowcytometry is best used in the measurement of: 
Select and explain. 
A. Serum level of LDH, B. T4, T8 serum ratio in AIDS, C. To count the RBCs in blood, D. Separation of proteins
B: T4, T8 serum ratio in AIDS
Answer: B: T4, T8 serum ratio in AIDS 
Explanation: None