This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Operative Gynecology, Subject name: Gynaecology & Obstetrics
Upon Hysteroscopy which of the following cannot be seen: 
Select and explain. 
A. Tubal ostia, B. Cervix, C. Endometrium, D. Tubal patency
D: Tubal patency
Answer: D: Tubal patency 
Explanation: Hysteroscopy is best for diagnosing lesions within the uterine cavity Also: Abnormal Uterine Bleeding Oligomenorrhea amenorrhea, Recurrent Pregnancy loss Endometrial carcinoma, Un-explained infeility Suspected anomalies Missing IUCDs Diagnosing intra uterine submucous fibroids, Polyps, adhesions Septums etc.