<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 70-year-old man presents for his annual check-up. He says he feels well except for occasional abdominal pain. He describes the pain as 410510 in intensity, diffusely localized to the periumbilical and epigastric regions, radiating to the groin. The pain occurs 12 times a month and always subsides on its own. The patient denies any recent history of fever, chills, nausea, vomiting, change in body weight, or change in bowel andor bladder habits. His past medical history is significant for hypertension, hyperlipidemia, and peripheral vascular disease, managed with lisinopril and simvastatin. The patient reports a 40-pack-year smoking history and 12 alcoholic drinks a day. The blood pressure is 150100 mm Hg and the pulse is 80min. Peripheral pulses are 2 bilaterally in all extremities. Abdominal exam reveals a bruit in the epigastric region along with mild tenderness to palpation with no rebound or guarding. There is also a pulsatile abdominal mass felt on deep palpation at the junction of the periumbilical and the suprapubic regions. The remainder of the physical exam is normal. Laboratory studies show:Serum total cholesterol 175 mgdLSerum total bilirubin 1 mgdLSerum amylase 25 ULSerum alanine aminotransferase ALT 20 ULSerum aspartate aminotransferase AST 16 ULWhich of the following is the most likely diagnosis in this patient?? A: Abdominal aortic aneurysm, B: Acute pancreatitis, C: Mesenteric ischemia, D: Acute gastritis, E: Diverticulitis,  <response>: Based on the description of the abdominal pain and physical exam findings, the most likely diagnosis is an abdominal aortic aneurysm AAA. The key findings supporting this diagnosis are:- Epigastric and periumbilical pain that radiates to the groin- Pulsatile abdominal mass felt at the umbilicus - Abdominal bruit heard on auscultation- Elderly male patient with risk factors for AAA including smoking, hypertension, and peripheral vascular diseaseThe normal lab results make acute pancreatitis, mesenteric ischemia, acute gastritis, and diverticulitis very unlikely. The history and physical exam are classic for an AAA.A: Abdominal aortic aneurysm 