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: Unknown
[{'content': 'Cause of repeated 2nd trimester foetal loss: \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 abortion:\nFirst trimester: defective germ plasm, hormonal deficiency, trauma, acute infection.\nMid trimester: Cervical incompetence, uterine malformations, uterine fibroid, low implantation of placenta, twins and hydramnios', 'role': 'assistant'}]