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': 'In a 6 membered family, there are two parents and four children all aged between 2-6 years. On eof the children is completely immunized for his age, whereas other 3 siblings are totally unimmunized. One of the unimmunized child developed measles. 6 days later 2 other children developed measles. SAR is? \nSelect and explain. \nA. zero, B. 33%, C. 66%, D. 100%', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., 100% o In this family of 6 members: Parents are not susceptilble because adults are usually not susceptible to measles. 1 child is immunized --> Not susceptile for measles Remaining 3 children are non-immunized --> susceptible for measles. All 3 susceptible children developed measles within one incubation period (Incubation period of measles is 23 weeks)", 'role': 'assistant'}]