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
Endodermal cloaca gives rise to all of the following except - 
Select and explain. 
A. Rectum, B. Lower 1/2 of anal canal, C. Upper 1/2 of anal canal, D. Mucous membrane of bladder
B: Lower 1/2 of anal canal
Answer: B: Lower 1/2 of anal canal 
Explanation: Lower part of anal canal below the pectinate line develops from ectodermal invagination i.e. proctodeum.