The ovary().
选项：

A:lies against the anterior pelvic wall
B:lies within the ovarian fossa, which is bounded superiorly by the internal iliac vessels
C:receives its blood supply from the ovarian artery,which courses through the ovarian ligament to reach the ovary
D:has lymphatic drainage which goes to lumbar lymph nodes
E:releases ova directly into the isthmus of the uterine tube