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
During the Window period of patient with AIDS ? 
Select and explain. 
A. ELISA is - ye, B. Western Blot is - ye, C. Both are - ye, D. PCR is - ve
C: Both are - ye
Answer: C: Both are - ye 
Explanation: Ans. is 'c' i.e. Both are (-) ye