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
Which of the following streptococcal antigen cross reacts with synol fluid ? 
Select and explain. 
A. Carbohydrate (group A), B. Cell wall protein, C. Capsular hyaluronic acid, D. Peptidoglycan
C: Capsular hyaluronic acid
Answer: C: Capsular hyaluronic acid 
Explanation: Ans. is 'c' i.e., Capsular hyaluronic acid