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: Dental
[{'content': 'Active search for disease in an apparently healthy individual is \nSelect and explain. \nA. Monitoring, B. Case finding, C. screening, D. Sentinel surveillance', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]