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
Which of the following statements is true about the epidemiological determinants of measles - 
Select and explain. 
A. Measles virus survives outside the human body for 5 days, B. Carriers are important sources of infection, C. Secondary attack is less than that of rubella, D. Incidence of measles is more in males than females
C: Secondary attack is less than that of rubella
Answer: C: Secondary attack is less than that of rubella 
Explanation: SAR of some important infectious diseases

Measles → 80% 
Rubella → 90 - 95% 
Chickenpox → 90%
Pertussis → 90%
Mumps → 86%