Answer the question.

Q. In a day care centre having 20 children, a 3 year old child develops chickenpox. Secondary to this case, 5 more children develop chickenpox. Of 20 children in this day care centre, 3 other children were previously vaccinated for chickenpox, while one child had got chickenpox six months back. The secondary attack rate of chickenpox in this case would be-
A) 25%
B) 29.4%
C) 31.25%
D) 33.33%

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