Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: Reviewing the CT angiography of a 70-year-old man under study for abdominal aortic aneurysm, the radiologist reports the presence of complete occlusion of the inferior mesenteric artery. The patient is completely asymptomatic. Occlusion of the inferior mesenteric artery occurs asymptomatically on many occasions since the irrigating territory can receive flow from: 
 Options:  <1> The middle colic artery. <2> The gastroduodenal artery. <3> The left inferior epigastric artery. <4> The splenic artery. <5> The gastroepiploic artery.
