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
Microscopical appearance of cervical mucus after ovulation is: 
Select and explain. 
A. Shows pattern on drying, B. Is thick, C. Is thin and cellular, D. Is thin and alkaline
B: Is thick
Answer: B: Is thick 
Explanation: The fern test can determine the presence or absence of ovulation or the time of ovulation. When cervical mucus is spread on a clean, dry slide and allowed to dry in air, it may or may not assume a frondlike pattern when viewed under the microscope. The fern frond pattern indicates an estrogenic effect on the mucus without the influence of progesterone; thus, a non-frondlike pattern can be interpreted as showing that ovulation has occurred. Progesterone makes the mucus thick and cellular. Ref: Kawada C., Hochner-Celnikier D. (2013). Chapter 35. Gynecologic History, Examination, & Diagnostic Procedures. In A.H. DeCherney, L. Nathan, N. Laufer, A.S. Roman (Eds), CURRENT Diagnosis & Treatment: Obstetrics & Gynecology, 11e.