A nurse is assessing a client who is taking lisinopril to treat hypertension. Which of the following findings is a priority to report?

A. Nausea is a common side effect of many medications, including lisinopril, but it is not immediately life-threatening. B. A dry cough is a common side effect of ACE inhibitors, including lisinopril, but it is not an emergency unless it is severe. C. Swelling of the tongue (angioedema) is a potentially life-threatening side effect of ACE inhibitors and requires immediate medical attention. D. Nasal congestion is a less concerning side effect and is not as urgent as angioedema.