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': 'In the perspective of the busy life schedule in the modern society, the accepted minimum period of sexual cohabilitation resulting in no offspring for a couple to be declared infertile is: \nSelect and explain. \nA. One year, B. One and a half - year, C. Two years, D. Three years', 'role': 'user'}, {'content': 'Answer: A \nExplanation: If a couple fails to achieve pregnancy after one year of “unprotected” and regular intercourse, it is an indication to investigate the couple for infertility.\n• Infertility:\n– Primary : When no previous pregnancies have occurred.\n– Secondary : When a prior pregnancy although not necessary although not necessary a live birth, has occurred.', 'role': 'assistant'}]