This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gynaecological Diagnosis, Subject name: Gynaecology & Obstetrics
[{'content': 'All are tubal patency tests EXCEPT \nSelect and explain. \nA. Tubal CO2 insufflation test, B. Laproscopy, C. Fern test, D. HSG', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. c (Fern test). (Ref. Shaws, Textbook of Gynaecology, 12th/pg.l62)Tests for tubal patencyTests for ovulation1CO2 insufflation/Rubin's test (obsolete)BBT2HSGEndometrial biopsy3Laproscopic chromopertubationFern test4Sonosalpingography and standard USGFolliculometry (USG) -noninvasive, accurate, safe5HysteroscopyHormonal study (progesterone, LH and prolactin)6Transcervical falloscopy 7Ampullary and fimbria! salphingoscopy", 'role': 'assistant'}]