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
Mechanism responsible for high rates of spontaneous abortion in septate uterus is 
Select and explain. 
A. Distorted uterine cavity, B. Associated cervical abnormality, C. Implantation on avascular septum, D. Unfavourable endometrial lining
C: Implantation on avascular septum
Answer: C: Implantation on avascular septum 
Explanation: The primary mechanism responsible for spontaneous abortion in septate uterus is partial or complete implantation on avascular septum.