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
[{'content': 'Most common cause of repeated 2nd-trimester foetal loss is \nSelect and explain. \nA. Chromosomal anomaly, B. Intrauterine infection, C. Abnormality of cervix and uterus, D. Hormonal imbalance', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]