This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Horse shoe kidney is due to prevention of ascent by? 
Select and explain. 
A. Superior mesenteric aery, B. Inferior mesenteric aery, C. Supernumerary aeries, D. Ureters
B: Inferior mesenteric aery
Answer: B: Inferior mesenteric aery 
Explanation: Horseshoe kidney: the lower poles of the two kidneys may be fused. The connecting isthmus may lie either in front of or behind, the aoa and inferior vena cava. Ahorse shoe kidney doesn't ascent higher than the level of inferior mesenteric aery as the latter prevent its higher ascent Ref: Human embryology Inderbir Singh Tenth edition Page 288