This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'True morbidity in a population can be calculated by? \nSelect and explain. \nA. Sentinel surveillance, B. Passive surveillance, C. Active surveillance, D. Monitoring', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Active surveillance o True morbidity is calculated by --> Active surveillance o Missing cases are detected by --> Sentinal surveillance", 'role': 'assistant'}]