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': 'Which of the following is primary prevention \nSelect and explain. \nA. Screening test, B. Early diagnosis, C. Use of mosquito net, D. Restoration of lost function', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Use of mosquito net", 'role': 'assistant'}]