<prompt> HIV prevalence can be assessed bySentinel surveillanceActive surveillancePassive surveillanceRegister  <response>: 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 