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: Medicine
The most common cause of painless bleeding P.R. in a man is - 
Select and explain. 
A. Fissure-in-ano, B. Diverticulosis, C. Piles, D. None
C: Piles
Answer: C: Piles 
Explanation: None