This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NPCBVI, NACP, Subject name: Social & Preventive Medicine
For diagnosis of HIV infection in asymptomatic, minimum number of tests required is/are: 
Select and explain. 
A. 1, B. 2, C. 3, D. 4
C: 3
Answer: C: 3 
Explanation: Screening of HIV: Strategy 1: one out of three screening tests are used; Done for screening every blood unit before transfusion. Strategy II: Two out of three screening tests are used; Done for screening person who is symptomatic with any one of AIDS defining illness. Strategy III: All three screening tests are used; Done for screening person who is asymptomatic.