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
Pectinate line is an impoant landmark because? 
Select and explain. 
A. It marks a divide in nerve supply, B. It marks the location of change in type of epithelium, C. It represents a lymphatic and venous divide, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: All of the above