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: Microbiology
Which of the following methods is adopted for 
screening HIV infection? 
Select and explain. 
A. Virus isolation, B. Western blot followed by ELISA, C. ELISA followed by western blot technique, D. Polymers chain reaction
C: ELISA followed by western blot technique
Answer: C: ELISA followed by western blot technique 
Explanation: None