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: Social & Preventive Medicine
[{'content': 'In the perspective of the busy life schedule in the modern society, the accepted minimum period of sexual cohabitation resulting in no offspring for a couple to be declared infertile is: \nSelect and explain. \nA. One year, B. One and a half, C. Two years, D. Three years', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Infertility implies apparent failure of a couple to conceive.\nIf a couple fails to achieve pregnancy after 1 year of unprotected and regular intercourse,\nit is an indication to investigate the couple.', 'role': 'assistant'}]