This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical, surgical and gynaecological illness complicating pregnancy, Subject name: Gynaecology & Obstetrics
[{'content': "Most common hea disease associated with pregnancy is \nSelect and explain. \nA. Mitral stenosis, B. Mitral regurgitation, C. Patent ductus aeriosus, D. Tetralogy of fallot's", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mitral stenosis is the most common lesion seen in pregnancy, accounting for 90% cases of rheumatic disease The normal mitral valve area is about 4cm2-6cm2 Symptoms appear when stenosis <2.5cm2 Critical or severe stenosis </=1cm2 - have hight rate of Pulmonary edema(55%) and arrhthmias (33%) Reference: Textbook of Obstetrics; DC.DUTTAS 9th edition; Page no: 260', 'role': 'assistant'}]