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': "Which of the following is an absolute indication for caesarean section in pregnancy associated with hea disease? \nSelect and explain. \nA. Pulmonary stenosis, B. Coarctation of aoa, C. Eisenmenger syndrome, D. Ebstein's anomaly", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Coarctation of aoa', 'role': 'assistant'}]