This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
Most common cause of repeated 2nd-trimester foetal loss is 
Select and explain. 
A. Chromosomal anomaly, B. Intrauterine infection, C. Abnormality of cervix and uterus, D. Hormonal imbalance
C: Abnormality of cervix and uterus
Answer: C: Abnormality of cervix and uterus 
Explanation: Common known causes of aboion: First trimester: defective germ cells, hormonal deficiency, trauma, acute infection. Second trimester: Cervical incompetence, uterine malformations, uterine fibroid, low implantation of placenta, twins and hydramnios