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
[{'content': 'Under which level of prevention should sentinel surveillance be categorised \nSelect and explain. \nA. Primordial prevention, B. Primary prevention, C. Secondary prevention, D. Teiary prevention', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Sentinel surveillance is a method for identifying the missing cases and thereby supplementing the notified cases. it estimates disease prevalence in the total population. Repoing biases are minimised. It detects missing cases; so it comes under secondary prevention. Ref : Park&;s Textbook of Preventive and Social Medicine; 23rd edition - Pgno 40', 'role': 'assistant'}]