A nurse is caring for a client who is newly admitted and has angina. The client asks the nurse, "Why am I taking nitroglycerin?" Which of the following responses should the nurse make?

"Nitroglycerin dilates cardiac blood vessels to deliver more oxygen to the heart."

"Nitroglycerin acts as a bronchodilator to open small airways and decrease shortness of breath."

"Nitroglycerin relieves nausea and prevents vomiting, which could lead to aspiration."

"Nitroglycerin decreases chest pain by dissolving blood clots that are occluding the arteries."