This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Blood supply of sigmoid colon is by: 
Select and explain. 
A. Middle colic aery, B. Marginal aery, C. Left colic aery, D. All
B: Marginal aery
Answer: B: Marginal aery 
Explanation: B. i.e. Marginal aery