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 pregnancy, the corpus luteum functions for how many days : \nSelect and explain. \nA. 8 to10, B. l0 to 12, C. 12 to 14, D. 18 to 20', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 12 to 14', 'role': 'assistant'}]