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
Virulence or pathogenicity of pneumococcus depends upon- 
Select and explain. 
A. Capsular polysaccharide, B. Cell wall antigen, C. Flagellar antigen, D. Fimbrial antigen
A: Capsular polysaccharide
Answer: A: Capsular polysaccharide 
Explanation: Ans. is 'a' i.e., Capsular polysaccharide