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
Which of the following vessels supply the anal canal? 
Select and explain. 
A. Superior rectal aery, B. Middle rectal aery, C. Inferior rectal aery, D. all of the following
D: all of the following
Answer: D: all of the following 
Explanation: Ans: D. all of the above aeries supply rectal canal(Ref: Gray's 41/e p1058, 40/e p1155-1159; Manual of Total Mesorectal Excision by Moran, Richard John Heald (2013)/p40)Anal canal - Supply:By superior rectal, middle rectal, inferior rectal branches of pudendal aery.Occasionally by median sacral aery.