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: Microbiology
Streptococcal cell wall polysacharide cross reacts with? 
Select and explain. 
A. Myocardial muscle, B. Cardiac value, C. Endocardium, D. Synol fluid
A: Myocardial muscle
Answer: A: Myocardial muscle 
Explanation: Ans. is 'a' i.e., Myocardial muscle Group A carbohydrate (cell wall polysaccharide of gorup A streptococcus, i.e. streptococcus pyogenes) cross reacts with myocardium.