<s>[INST] context: Eisenmenger syndrome This syndrome is secondary pulmonary hypeension that can develop with any cardiac lesion in which pulmonary vascular resistance becomes greater than the systemic vascular resistance and there should also be some right to left shunting. The most common underlying defects are atrial or ventricular septal defects and persistent ductus aeriosus. Patients usually are asymptomatic but eventually pulmonary hypeension becomes severe enough to cause right to left shunting. The prognosis for pregnancy depends upon the severity of pulmonary hypeension. The moality rate in Eisenmenger's syndrome is 50%. It is the maximum moality for any cardiovascular disorder in pregnancy. So termination of pregnancy is done in most cases. Maternal tolerance to specific hea conditions Well tolerated * Pulmonary stenosis * Aoic insufficiency * Mitral insufficiency * Congenital hea block Well tolerated if pulmonary hypeension is not present * Atrial septal defects * Ventricular septal defects * Patent ductus Variable tolerance depending on the functional capacity of the hea * Uncomplicated Aoic coarctation * Aoic stenosis * Mitral regurgitation * Aoic regurgitation Poorly tolerated and source of significant problems during pregnancy. * Mitral stenosis * Peripaum cardiomyopathy * Primary pulmonary hypeension * Eisenmenger's syndrome * Marfan's syndrome with dilated aoic root * Metallic valve prosthesis * Congenital cyanotic hea disease * Conditions listed in group C if pulmonary hypeension is present. * Any class III or IV lesion. [/INST] question: Most common hea disease which is associated with maximum moality during pregnancy | options: A: >Eisenmenger syndrome B: >MS C: >AS D: >VSD | answer: A </s>