Pelvic diaphragm consists of all except: (A) Pubococcygeus, (B) Iliococcygeus, (C) Ischiocavernous, (D) Ischiococcygeus
Answer is C. Levator ani muscle forms pelvic diaphragm. Levator ani muscle consists of three main divisions.

Pubococcygeus
Iliococcygeus
Ischiococcygeus.