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
[{'content': 'Virulence or pathogenicity of pneumococcus depends upon- \nSelect and explain. \nA. Capsular polysaccharide, B. Cell wall antigen, C. Flagellar antigen, D. Fimbrial antigen', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Capsular polysaccharide", 'role': 'assistant'}]