The 74-Year-Old Man Asks the Nurse If He Needs to Get

The 74-year-old man asks the nurse if he needs to get revaccinated with the pneumococcal vaccine as he has not had one for 2 years.The most informative response by the nurse would be:

A) "Yes. You should have the pneumonia vaccine every year."
B) "No. One vaccination for pneumonia is all you need."
C) "Yes. Every year they alter the vaccine to include more infectious organisms."
D) "No. You only need to be revaccinated every 5 years."