<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 68-year-old man presents for a screening ultrasound scan. He has been feeling well and is in his usual state of good health. His medical history is notable for mild hypertension and a 100-pack-year tobacco history. He has a blood pressure of 12886 and heart rate of 62min. Physical examination is clear lung sounds and regular heart sounds. On ultrasound, an infrarenal aortic aneurysm of 4 cm in diameter is identified. Which of the following is the best initial step for this patient?? A: Beta-blockers, B: Surveillance, C: Urgent repair, D: Elective repair, E: Reassurance,  <response>: This is a question about the management of an incidentally found abdominal aortic aneurysm AAA in an asymptomatic patient. The key findings are that the patient is a 68-year-old man with mild hypertension, a significant smoking history, and a 4 cm infrarenal AAA found on screening ultrasound. He is otherwise asymptomatic. The initial step in management depends on the size of the aneurysm. AAAs less than 5.5 cm in men are generally managed conservatively with imaging surveillance, while those 5.5 cm or greater warrant elective surgical repair to prevent rupture. Of the choices given, surveillance is the best initial step for this patient with a 4 cm AAA. Beta blockers may be indicated to control blood pressure but are not specific aneurysm therapy. Urgent repair is not indicated for an asymptomatic 4 cm AAA. Reassurance alone without a surveillance plan would be inappropriate.B: Surveillance 