The vaccine for human papillomavirus (HPV)
A. is most effective if the vaccine is administered before the adolescent becomes sexually active.
B. is available for girls, but the vaccine for boys is still under development.
C. is still being tested by the Centers for Disease Control and Prevention to determine its safety.
D. is available but, because HPV is so rare, many adolescents are not being vaccinated.
Answer: A
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