This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
Absence of which amongst the following is the most common variation 
Select and explain. 
A. Right colic aery, B. Middle colic aery, C. Left colic aery, D. Superior rectal aery
A: Right colic aery
Answer: A: Right colic aery 
Explanation: The right colic aery arises from about the middle of the concavity of the superior mesenteric aery, or from a stem common to it and the ileocolic. It passes to the right behind the peritoneum , and in front of the right internal spermatic or ovarian vessels, the right ureter and the psoas major, toward the middle of the ascending colon; sometimes the vessel lies at a higher level, and crosses the descending pa of the duodenum and the lower end of the right kidney. image ref - britannica.com