This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pathology of Conception, Subject name: Gynaecology & Obstetrics
[{'content': 'In the perspective of the busy life schedule in the modem 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-year, C. Two years, D. Three year', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' i.e., One year If a couple fails to achieve pregnancy after one year of "unprotected\' and regular intercourse, it is an indication to investigate the couple', 'role': 'assistant'}]