This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
HIV prevalence can be assessed by 
Select and explain. 
A. Sentinel surveillance, B. Active surveillance, C. Passive surveillance, D. Register
A: Sentinel surveillance
Answer: A: Sentinel surveillance 
Explanation: HIV Surveillance: 1) HIV Sentinel surveillance 2) HIV Sero-surveillance 3) AIDS case surveillance 4) STD Surveillance 5) Behavioral surveillance and 6) Integration with surveillance of other diseases like tuberculosis, etc. Ref: Park&;s Textbook of Preventive and Social Medicine, 24th edition, Page no. 452