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
Secondary attack rate of peussis in unimmunization household contacts of peussis 
Select and explain. 
A. 30%, B. 40%, C. 60%, D. 90%
D: 90%
Answer: D: 90% 
Explanation: Ans. is 'd' i.e., 90% SAR of some impoant infectious diseases Measles Rubella Chicken pox Peussis Mumps 80% 90 - 95% -- 90% -- 90% 86%