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
Muscle which forms pelvic diaphragm 
Select and explain. 
A. Deep transvere perineal muscle, B. Spincter urethrae, C. Levator ani, D. Superficial transverse perineal muscle
C: Levator ani
Answer: C: Levator ani 
Explanation: The pelvic diaphragm is a muscular paition formed by the levator ani and coccygei, with which may be included the parietal pelvic fascia on their upper and lower aspects. The pelvic floor separates the pelvic cavity above from the perineal region (including perineum) . ref - BDC 6e vol2 pg367-369