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 epidemological determinants of measles ? \nSelect and explain. \nA. Measles virus survives outside the human body for 5 days, B. Carriers are impoant sources of infection, C. Secondary attack is less than that of rubella, D. Incidence of measles is more in males than females', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Secondary attack rate is less than that of rubella SAR of some impoant infectious diseases o Measles 80% o Rubella 90 - 95% o Chicken pox - 90% o Peussis - 90% o Mumps - 86% About other options o The measles virus cannot survive outside the human body for any length of time. But it retains infectivity when stored at sub - zero temprature. The only source of infection is a case of measles, carriers are not known to occur. Incidence of measles is same in males and females.", 'role': 'assistant'}]