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
[{'content': 'Recurrent abortion in 1st trimester is most often due to: \nSelect and explain. \nA. Chromosomal abnormalities, B. Uterine anomaly, C. Hormonal disturbance, D. Infection', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most common cause of recurrent abortions:\n1st trimester\n\nGenetic factor/defective germplasm.\nMost common type of chromosomal abnormality is balanced translocation.\n\n2nd trimester \n\nCervical incompetence', 'role': 'assistant'}]