A Mother Tells the Nurse, "I Am So Concerned About

A mother tells the nurse, "I am so concerned about my child. He may not have adequate immunity to chickenpox." What is the best response by the nurse?

A) "You don't have to worry as long as your child has received all of his vaccinations."
B) "We can give your child another booster if you would like."
C) "There really is no way to know if your child will develop chickenpox."
D) "We can draw a titer to determine if there is adequate immunity."