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
Not true about the anal canal is - 
Select and explain. 
A. Completely lined by stratified squamous epithelium, B. Supplied by pudendal nerve, C. Drained by veins forming portosystemic anastomosis, D. Part below pectinate line is supplied by inferior rectal artery
A: Completely lined by stratified squamous epithelium
Answer: A: Completely lined by stratified squamous epithelium 
Explanation: The anal canal is not completely lined by squamous epithelium. The part above pectinate line is lined by simple columnar epithelium, the part between pectinate and Hilton's white line is lined by non-keratinized stratified squamous epithelium, and the part below Hilton's line is lined by true skin (stratified keratinized squamous epithelium).
The lower part of the anal canal is supplied by pudendal nerve and is supplied by the inferior rectal artery.
The anal canal is a site of the portosystemic anastomosis.