This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Elimination, Eradication, Surveillance, Subject name: Social & Preventive Medicine
[{'content': 'Measures involved in sentinel surveillance include all of the following except:- \nSelect and explain. \nA. Identifying missing cases in notification of diseases, B. Identifying new cases of infection, C. Identifying old and new cases, D. Identifying cases free of disability', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Sentinel surveillance: It is a method for identifying the missing cases & thereby supplementing the notified cases. It is extrapolated to entire population, to estimate disease prevalence in total population. It minimizes repoing bias & simplifies feedback of information to the providers.', 'role': 'assistant'}]