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': 'Shirodkar stitch is given at ..... of pregnancy : \nSelect and explain. \nA. 6 weeks, B. 12 weeks, C. 14-16 weeks, D. 20-24 weeks', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 14-16 weeks', 'role': 'assistant'}]