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 statements is true about the epidemiological determinants of measles? \nSelect and explain. \nA. Measles virus survives outside the human body for 5 days, B. Carriers are important sources of infection, C. Secondary attack rate is less than that of rubella, D. Incidence of measles is more in males than females', 'role': 'user'}, {'content': 'Answer: C \nExplanation: SAR of measles = 80% and Rubella = 90%', 'role': 'assistant'}]