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: Pathology
MC valve involved in Rheumatic fever ? 
Select and explain. 
A. Mitral, B. Aoic, C. Pulmonary, D. Tricuspid
A: Mitral
Answer: A: Mitral 
Explanation: Ans. is 'a' i.e., Mitral Mitral valve is involved most commonly. o RHD is the most common cause of mitral stenosis.