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
Aboions in the second trimester is mostly due to: 
Select and explain. 
A. Incompetent cervix, B. Defective genes, C. Tuberculosis, D. Trauma
A: Incompetent cervix
Answer: A: Incompetent cervix 
Explanation: Incompetent cervix