This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pathology
[{'content': 'MC valve involved in Rheumatic fever - \nSelect and explain. \nA. Mitral, B. Aoic, C. Pulmonary, D. Tricuspid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Rheumatic fever is an acute , immunologically mediated multisystem inflammatory disease that occurs after group A streptococcal infection The valvular disease principally takes the form of deforming mitral stenosis; indeed rheumatic hea disease is essentially the only cause of acquired mitral stenosis Robbins 9 th page no. 391', 'role': 'assistant'}]