<prompt> A 36 years old woman has absence of menses for the last 4 months. Pregnancy test is negative. Serum levels of LH FSH are raised. Serum estradiol level is low. These findings suggest:Bilateral tubal obstructionPCODPremature menopauseExogenous estrogen administration  <response>: Premature menopause Ovarian failure occurring 2 SD in years before the mean menopausal age in a population. It is clinically defined as secondary amenorrhoea for at least 3 months with FSH level FSHLH ratio Low E2 level In a woman under 40 years of age. Average age of attaining menopause World 51 years India 47 years 