Gynaecology & Obstetrics General b861b844 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. High-Yield Explanation The follicular activation continues in a constant pattern that is independent of pituitary stimulation.