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': 'Screening of disease is ...... level of prevention: \nSelect and explain. \nA. Primordial, B. Primary, C. Secondary, D. Teiary', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Secondary', 'role': 'assistant'}]