Correct Answer: A

Rationale:
Choice A is correct because immunosuppressants (e.g., prednisone) reduce vaccine efficacy by weakening immune response, per CDC guidelines.
Choice B is incorrect as antibiotics don't typically affect vaccines.
Choice C is wrong because antihistamines lack vaccine interactions.
Choice D is incorrect since only immunosuppressants apply.

Correct Answer: B

Rationale: The correct answer is B because acetaminophen is safe for infants to reduce fever.
Choice A is incorrect (aspirin risks Reye’s syndrome).
Choice C is wrong (dextromethorphan risks respiratory depression).
Choice D is inaccurate (antibiotics don’t treat viral illness).

Correct Answer: B

Rationale:
Choice B is correct because pictograms clarify instructions visually, aiding comprehension and adherence, especially for low-literacy patients.
Choice A is incorrect as assuming understanding can lead to errors.
Choice C is wrong because health literacy varies from general literacy, needing specific attention.
Choice D is incorrect here as it's a good strategy but not listed in this question's options correctly—B fits best.

Correct Answer: B

Rationale:
Choice B is correct because the blood-brain barrier, with its tight junctions, slows entry of many drugs, especially water-soluble ones, protecting the brain.
Choice A is incorrect as water-soluble, ionized drugs cross poorly due to barrier selectivity.
Choice C is wrong because the fetal-placental barrier doesn't fully block drugs—many cross and affect the fetus.
Choice D is incorrect since lipid-soluble drugs readily pass these barriers, posing risks in pregnancy.

Correct Answer: D

Rationale:
Choice D is correct because insulin (protein stability), amoxicillin suspension (post-reconstitution), and vaccines (biological potency) require refrigeration to maintain efficacy, per storage guidelines.
Choice A is incorrect alone as it's one drug.
Choice B is wrong by itself because amoxicillin is just part.
Choice C is incorrect solo since vaccines are only one group.