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
In which case homologous artificial insemination is used in females: 
Select and explain. 
A. Hormonal disturbance, B. Tubal block, C. Cervical factor, D. All of the above
C: Cervical factor
Answer: C: Cervical factor 
Explanation: Cervical factor: cervical mucous protects sperm from the hostile environment of the vagina and also phagocytosis.
cervical factor when cannot be treated is overcome by ART procedures IUI, IVF, GIFT.
cervical mucus quality improved by conjugated estrogen 1.25mg orally daily starting on day 8 for 5 days