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
Group A carbohydrate of Str. pyogenes cross reacts with human 
Select and explain. 
A. Synovial fluid, B. Myocardium, C. Cardiac valves, D. Vascular intima
C: Cardiac valves
Answer: C: Cardiac valves 
Explanation: None