<s>[INST] context: Abdominal Aortic Aneurysm* 95% aneurysms are infra renal* Most common Type of Larger Vessel Aneurysm and is found in 2% population at autopsy.* MC cause is Atheromatous degeneration* MC symptom - Back and Abdominal Discomfort* Site of rupture: M/c site = postero lateral (80%)* 2nd m/c site = anterior (20%)* Less than 50 per cent of patients with rupture survive to reach hospital.* Anterior rupture results in free bleeding into the peritoneal cavity; very few patients reach hospital alive.* Posterior rupture on the other hand produces a retroperitoneal hematoma* Ruptured abdominal aortic aneurysm is a surgical emergency; it should be suspected in a patient with the triad of severe abdominal and/or back pain, hypotension and a pulsatile abdominal mass* Bailey and Love says "It should always be remembered that the treatment of ruptured aneurysm is operation, not monitoring and resuscitation".Indications for Surgery* All symptomatic aneurysm (m/c symptom is back and abdominal discomfort)* Aneurysms size greater than 55 mm on USG antero-posteriorly.* Aneurysms < 55 mm in diameter needs Regular USG assessment. [/INST] question: A smoker patient presents with abdominal aortic aneurysm with diameter of 44 mm with non-specific abdominal pain what is the ideal answer below? | options: A: Immediately operate B: Operate when size becomes >55 mm diameter C: Serial USG advised until it becomes 77 mm Diameter D: No treatment needed | answer: B </s>