A nurse is caring for a client who has a prescription for nifedipine. Which of the following findings should the nurse assess prior to administration of the medication?

The correct answer is A: Blood pressure. Nifedipine is a calcium channel blocker used to treat hypertension. Before administering, the nurse should assess the client's blood pressure as this medication can cause hypotension as a side effect. Monitoring blood pressure ensures safety and effectiveness of the medication. Assessing respiratory rate, temperature, and oxygen saturation are important but not specific to nifedipine administration. Blood pressure is the priority assessment in this case.