<prompt> Which among the following is the best diagnostic method for finding out ovulation?UltrasoundLaparoscopyEndometrial biopsyChromotubation  <response>: The finding of secretory endometrium confirms ovulation. The use of an endometrial biopsy EMB near the end of the luteal phase can provide reassurance of an adequate maturational effect on the endometrial lining. Within 48 hours of ovulation, the cervical mucus changes under the influence of progesterone to become thick, tacky, and cellular, with loss of the crystalline fernlike pattern on drying. Ref: Ghadir S., Ambasumyan G., DeCherney A.H. 2013. Chapter 53. Infeility. In A.H. DeCherney, L. Nathan, N. Laufer, A.S. Roman Eds, CURRENT Diagnosis Treatment: Obstetrics Gynecology, 11e. 