A client arrives to the emergency department with chest pain after taking sildenafil. Based on the client's history, which medication should the nurse withhold?

A. Morphine is used for pain management and is not contraindicated with sildenafil.B. Aspirin is used for its antiplatelet effect and is not contraindicated with sildenafil.C. Heparin is used as an anticoagulant and is not contraindicated with sildenafil.D. Nitroglycerin is contraindicated with sildenafil because the combination can cause severe hypotension.