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
The major antigenic determinant of H. influenzae is- 
Select and explain. 
A. 'M' protein, B. Capsular polysaccharide, C. Catalase, D. Coagulase
B: Capsular polysaccharide
Answer: B: Capsular polysaccharide 
Explanation: None