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: Surgery
Best investigation to diagnose hemorrhoids is 
Select and explain. 
A. Proctoscopy, B. DRE, C. Barium enema, D. USG
A: Proctoscopy
Answer: A: Proctoscopy 
Explanation: Proctoscopy is IOC for hemorrhoids.