This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Embryology and abdominal wall layer, Subject name: Anatomy
The simple columnar and stratified columnar epithelia lining the lower pa of the anal canal is derived from 
Select and explain. 
A. Mesoderm, B. Endoderm, C. Ectoderm, D. Neuroectoderm
C: Ectoderm
Answer: C: Ectoderm 
Explanation: The anal canal is formed from two components--the hindgut and proctodeum. The epithelium lining the lower anal canal is derived from ectoderm lining the proctodeum. above the pectinate line develop from:-endodermal cloacae beiow the pectinate line delelop from :-ectodermal proctodeum