This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
During the Window period of patient with AIDS - 
Select and explain. 
A. ELISA is -ve, B. Western Blot is -ve, C. Both are -ve, D. PCR is -ve
C: Both are -ve
Answer: C: Both are -ve 
Explanation: sero negative infective stage is known as the window period REF:ANANTHANARAYANAN TEXT BOOK OF MICROBIOLOGY 9EDITION PGNO.579