At what age would it be most effective to be vaccinated against meningitis?
Choose one:
A. Being vaccinated at age 19 or younger is most effective.
B. Vaccination is best at age 23, because this is the last opportunity for vaccine to be effective.
C. You should not get vaccinated, as vaccines are not effective.
D. There is no difference in effectiveness if you are vaccinated before you turn 19 or after you turn 20.