Correct Answer: C

Rationale: The correct answer is C: "I can visit my nephew who has chickenpox 5 days after the sores have crusted." This statement indicates an understanding of infection prevention because chickenpox is contagious until the sores crust over completely. Visiting after this period reduces the risk of transmission.

Choice A is incorrect because handwashing should be done for at least 20 seconds with soap and water, not hot water.

Choice B is incorrect as pregnant women should avoid cleaning cat litter boxes due to the risk of toxoplasmosis.

Choice D is incorrect because antibiotics are ineffective against viruses.
In summary, choice C is correct because it demonstrates knowledge of the appropriate timing to visit someone with a contagious illness, while the other choices contain misinformation regarding infection prevention.

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