This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'True statement regarding Pneumococcus is: \nSelect and explain. \nA. Virulence is due to polysaccharide capsule, B. Capsule is protein in nature, C. Antibodies against capsule are not protective, D. Resistance to penicillin has not yet been reported', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Virulence is due to polysaccharide capsule* Capsular polysaccharide is the principal virulence factor, protects it from phagocytosis. Other virulence factors are toxins (pneumolysin and autolysin).", 'role': 'assistant'}]