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
Post coital test is useful for evaluating the following factors, EXCEPT: 
Select and explain. 
A. Fallopian tube block, B. Cervical factor abnormality Sperm count, C. Sperm count, D. Sperm abnormality
A: Fallopian tube block
Answer: A: Fallopian tube block 
Explanation: Testing for tubal patency can be performed by hysterosalpingography (HSG) or by chromotubation during laparoscopy. Post coital test orSims-Huhner test is used to evaluate cervical mucus. In the presence of high estrogen levels, the mucus should be copious and relatively clear. Mucus should be able to be stretched to >5 cm after being placed between two glass slides. At least five motile sperm per high-power field should be visible under the microscope. There should be a minimal number of other cell types, such as inflammatory cells. When dried, the mucus should form a ferning pattern. Ref: Hoffman B.L., Schorge J.O., Schaffer J.I., Halvorson L.M., Bradshaw K.D., Cunningham F.G., Calver L.E. (2012). Chapter 19. Evaluation of the Infeile Couple. In B.L. Hoffman, J.O. Schorge, J.I. Schaffer, L.M. Halvorson, K.D. Bradshaw, F.G. Cunningham, L.E. Calver (Eds), Williams Gynecology, 2e.