This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pelvis and Perineum 3, Subject name: Anatomy
Bleeding vessel in haemorrhoids is 
Select and explain. 
A. Superior rectal aery, B. Superior rectal vein, C. Middle rectal aery, D. Middle rectal vein
B: Superior rectal vein
Answer: B: Superior rectal vein 
Explanation: Bleeding vessel in haemorrhoids is superior rectal vein which is a branch of inferior mesenteric vein at the level of rectum. Dilation of these vessels leads to bleeding leading to internal haemorrhoids. Veins are better option than aery.