<prompt> Ovarian reserve is best indicated byLHFSHLH FSH ratioEstrogen  <response>: B i.e. FSHOvarian reserve can be best assessed by measuring FSH levels on 3rd day of menstrual cycle, clomiphene citrate challenge provocative test measures FSH levels on cycle day 10 after antiestrogen clomiphene citrate 100 mg administration from day 5 to 9. Serum inhibin B level and ultrasonic scanning to count the number of antral follicles in ovary are other methods.Ovarian Reserve- It refers to the size of resting nongrowing primordial follicle population, which reflects the quantity no of growing follicles and quality of oocytes within it. So ovarian reserve determines the functional reproductive potential of ovary.- Under the influence of FSH and LH, there is rapid growth of several follicles in ovary, during first few days of each menstrual cycle. But after a week only 1 follicle begins to outgrow all the others which involute by a process called atresia and thus preventing more than one child from developing with each pregnancy.- Ovarian reserve capacity of ovary to produce eggs decline with advancing age. Best predictor of ovarian reserve is age. Tests that can determine ovarian reserve include 