This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
True statement about anatomy of anal canal 
Select and explain. 
A. Puborectalis is essential to maintain continence, B. Internal sphincter is skeletal muscle, C. Internal sphincter remains in the state of tonic contraction, D. External sphincter is supplied by gluteal nerve
A: Puborectalis is essential to maintain continence
Answer: A: Puborectalis is essential to maintain continence 
Explanation: The anal canal is the most terminal pa of the lower GI tract/large intestine, which lies between the anal verge in the perineum below and the rectum above. The description in this topic is from below upwards, as that is how this region is usually examined in clinical practice. <img src=" /> Ref - sciencedirect.com