This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical Illness Complicating Pregnancy, Subject name: Gynaecology & Obstetrics
[{'content': 'MC hea disease associated with pregnancy: \nSelect and explain. \nA. Mitral stenosis, B. Mitral regurgitation, C. Patent ductus aeriosus, D. TOF', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most common hea disease seen in pregnancy is Rheumatic hea disease and the most common lesion is MITRAL STENOSIS.', 'role': 'assistant'}]