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 absence of feilization and implantation the corpus luteum persists for : \nSelect and explain. \nA. 2 - 3 days, B. 6 - 8 days, C. 12 - 14 days, D. 28 - 30 days', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 12 - 14 days', 'role': 'assistant'}]