This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Menstruation, Abnormal Menstruation, Menopausal Physiology and forsight of conception, Subject name: Gynaecology & Obstetrics
[{'content': 'Menopause is diagnosed by \nSelect and explain. \nA. Estradiol >20 pg/ml, B. Progesterone <40 ng/dl, C. FSH>40 IU/L, D. LH<20 IU/L', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Menopause - Permanent cessation of mensturation. Clinical diagnosis- Stoppage of menses for 1 year without any other pathology Cessation of menses before the age of 40 is known as premature ovarian failure Investigation- Increase FSH> 40mIU/ml ( 3 values at weekly interval required) LH>20 IU Estradiol <20 pg Vaginal cytology: maturation index : 10/85/5', 'role': 'assistant'}]