<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 67-year-old man presents to his primary care physician for a wellness checkup. The patient states he has been doing well and currently has no concerns. The patients daughter states that she feels he is abnormally fatigued and has complained of light-headedness whenever he gardens. He also admits that he fainted once. The patient has a past medical history of type II diabetes, hypertension, and constipation. He recently had a throat cold that he recovered from with rest and fluids. His temperature is 98.9F 37.2C, blood pressure is 16798 mmHg, pulse is 90min, respirations are 12min, and oxygen saturation is 99 on room air. Physical exam reveals a systolic murmur heard best along the right upper sternal border. An ECG is performed and demonstrates no signs of ST elevation. Cardiac troponins are negative. Which of the following is the most likely diagnosis?? A: Autoimmune valve destruction, B: Bicuspid valve, C: Calcification of valve leaflets, D: Incompetent valve, E: Outflow tract obstruction,  <response>: Based on the information provided in the question stem, the most relevant findings are that the 67-year-old man has a history of type 2 diabetes, hypertension, and constipation, recently recovered from a throat infection, has fatigue, lightheadedness, and a syncopal episode, and has a systolic heart murmur on exam. The vital signs show elevated blood pressure and the ECG does not show ST elevation. The negative cardiac troponins make an acute coronary syndrome less likely. The systolic heart murmur along with the patients symptoms of syncope and lightheadedness point towards a diagnosis involving valvular dysfunction, likely aortic stenosis given the systolic murmur. Calcification and stiffening of the aortic valve is a common age-related finding which can cause obstruction to left ventricular outflow. Of the choices provided, Calcification of valve leaflets seems most consistent with the clinical presentation.C: Calcification of valve leaflets 