This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'Ovarian senescence is described by all except \nSelect and explain. \nA. 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.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The follicular activation continues in a constant pattern that is independent of pituitary stimulation.', 'role': 'assistant'}]