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 most common type of anorectal malformation is 
Select and explain. 
A. Imperforate anus, B. Anal agenesis, C. Anorectal agenesis, D. Rectal atresia
C: Anorectal agenesis
Answer: C: Anorectal agenesis 
Explanation: The most common type of malformation involving the anal canal and rectum is anorectal agenesis, in which the rectum ends as a blind sac above the puborectalis muscle. The anal canal may form normally but does not connect with the rectum. This malformation is accompanied by various fistulas.