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
For a rectal carcinoma at 5cm from the anal verge the best acceptable operation is - 
Select and explain. 
A. Anterior resection, B. Abdominal perineal resection, C. Posterior resection, D. Local resection
A: Anterior resection
Answer: A: Anterior resection 
Explanation: Dentate line is 2 cm from the anal verge, so this tumor is 3 cm above the dentate line. A sphincter saving LAR can be done.