<prompt> The most impoant function of sentinel surveillance isTo find the total amount of disease in a populationTo find the incidence of the diseaseTo determine the trend of disease in a populationA more costly phenomenon  <response>: Sentinal surveillance It estimates disease prevalence in a population. Its a method for identifying the missing cases and thereby supplementing the notified cases. It provides more detailed information than that which could be obtained from the traditional notification system. Ref: Parks Textbook of Preventive and Social Medicine; 24th edition - Page no. 45 