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
Cervical mucus has following properties except: 
Select and explain. 
A. High oestrogen levels at midcycle make cervical mucus thick, B. Estrogen primed cervical mucus filters out non-sperm components of semen, C. Midcycle mucus creates a reservoir for sperm, D. Elevated oestrogen levels near ovulation increases sodium chloride concentration
A: High oestrogen levels at midcycle make cervical mucus thick
Answer: A: High oestrogen levels at midcycle make cervical mucus thick 
Explanation: High oestrogen levels at midcycle make cervical mucus thin and stretchy responsible for ferning pattern.