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 confirming the accuracy of the prescription. B. Telling him to take the medication and verifying the dosage later could result in harm if the dosage is incorrect. C. Informing him that he may refuse the medication is an option, but it does not address the potential error in dosage. D. Withholding the medication until the dosage can be confirmed is the safest action to prevent potential medication errors