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
Capsule of pneumococcus is: 
Select and explain. 
A. Polypeptide, B. Polysaccharide, C. Lipopolysaccharide, D. Not a Virulence factor
B: Polysaccharide
Answer: B: Polysaccharide 
Explanation: Polysaccharide