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': 'MTP cannot be done after : \nSelect and explain. \nA. 12 weeks, B. 20 weeks, C. 24 weeks, D. 28 weeks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 20 weeks', 'role': 'assistant'}]