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': 'Surgery for mitral stenosis during pregnancy is ideally done at : \nSelect and explain. \nA. 14 weeks, B. 20 weeks, C. 28 weeks, D. 32 weeks', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 14 weeks', 'role': 'assistant'}]