A nursing student asks another student, "What does the blood brain barrier have to do with medications?" Which of the following responses by the student is best?
A. "The barrier helps reduce the risk of infection, so not as many antibiotics are needed."
B. "It prevents some medications from affecting the central nervous system."
C. "There are only a few medications that don't cross the barrier, so we have to know those."
D. "It has to do with how medications affect brain growth in a developing fetus."
B
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