<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 72-year-old man with coronary artery disease comes to the physician because of intermittent episodes of substernal chest pain and shortness of breath. The episodes occur only when walking up stairs and resolves after resting for a few minutes. He is a delivery man and is concerned because the chest pain has impacted his ability to work. His pulse is 98min and blood pressure is 13277 mm Hg. Physical examination is unremarkable. An ECG shows no abnormalities. A drug that blocks which of the following receptors is most likely to prevent future episodes of chest pain from occurring?? A: Alpha-2 adrenergic receptors, B: Angiotensin II receptors, C: Aldosterone receptors, D: M2 muscarinic receptors, E: Beta-1 adrenergic receptors,  <response>: This is a clinical vignette describing a 72-year-old man with known coronary artery disease who is experiencing episodes of chest pain and shortness of breath when walking upstairs. The key findings are intermittent exertional angina with associated dyspnea in a patient with known CAD. The question asks which receptor blocking drug is most likely to prevent future episodes of chest pain.The choices given are different receptor types. Alpha-2, angiotensin II, and aldosterone receptors are not directly involved in myocardial oxygen demand or coronary vasodilation. M2 muscarinic blockade could help a little by increasing heart rate but would not be first line. Beta-1 adrenergic blockade reduces myocardial oxygen demand by decreasing heart rate, contractility, and afterload. This is the most direct way to reduce myocardial oxygen demand and prevent exertional angina.E: Beta-1 adrenergic receptors 