Gynaecology & Obstetrics Ovarian senescence is described by all except A Begins in utero within embryonic ovary. B More rapid in late 30s and early 40s. C Follicular activation is dependent on pituitary stimulation. D Programmed oocyte atresia. 💡 Explanation Ovarian senescence is described by all except ✓ Correct Answer: C. Follicular activation is dependent on pituitary stimulation.