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: Surgery
With regards to the anorectal angle, what is true 
Select and explain. 
A. It distributes intraabdominal forces onto the pelvic floor and plays and impoant role in continence mechanism, B. It is due to the pull of the external sphincter, C. It is around 30 degrees at trest, D. The angle increases at the time of defecation
A: It distributes intraabdominal forces onto the pelvic floor and plays and impoant role in continence mechanism
Answer: A: It distributes intraabdominal forces onto the pelvic floor and plays and impoant role in continence mechanism 
Explanation: Answer- A. It distributes intraabdominal forces onto the pelvic floor and plays and impoant role in continence mechanismAt rest the puborectalis muscle creates a 'sling' around the distal rectum, forming a relatively acute angle (Anorectal angle).It is 90 to 100 degrees at rest.Both the internal and external sphincters are innervated by pudendal nerve.