When preparing to administer a prescribed medication to a homeless male at a community psychiatric clinic, the client tells the nurse that he usually takes a different dosage. Which action should the nurse take?

A. Explaining that the dosage has been changed is not appropriate without verifying the correct dosage first. B. Withholding the medication until the dosage can be confirmed is the safest approach to prevent potential medication errors. C. Informing the client that he may refuse the medication is an option, but it does not address the potential discrepancy in dosage. D. Telling him to take the medication and then verifying the dosage at the next healthcare team meeting could result in a medication error and is not a safe practice