<prompt> HIV sentinel surveillance provides data mainly for:To assess the quality of related servicesTo identify high risk populationTo estimate disease incidenceTo monitor disease trends  <response>: HIV Sentinel surveillance: Aim- To monitor trends of HIV infection. Objectives include- Determining level of HIV infection among general population as well as high risk groups To understand trends of HIV epidemic To understand geographical spread of it Estimation of HIV prevalence disease burden Provide information for prioritization of programme resources evaluation of its impact 