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
Which of the following methods for assessment of female feility during a menstrual cycle can best predict the timing of ovulation? 
Select and explain. 
A. Basal Body Temperature (BBT), B. Fern Test, C. Spinnbarkeit phenomenon, D. Hormonal study
D: Hormonal study
Answer: D: Hormonal study 
Explanation: The best method of assessment of female feility that allows accurate prediction of ovulation is the measurement of urinary LH surge (Hormonal Test). Ref: Clinical Gynaecological Endocrinology and Infeility By Speroff, 7th Edition, Page 1036; Textbook of Gynecology By DC Dutta, 4th Edition, Page 106 221; Management of Common Problems in Obstetrics and Gynecology By T. Murphy Goodwin, Main 4. N. Montoro, Laila Muderspach, Subir Roy, 5th Edition, Page 430