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 cardiovascular condition during pregnancy has the highest maternal moality rate ? \nSelect and explain. \nA. Primary pulmonary hypeension, B. Marfan's syndrome, C. Coarctation of the aoa, D. Mitral stenosis", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Primary pulmonary hypeension', 'role': 'assistant'}]