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': 'Carrom coin appearance of pneumococcus is due to \nSelect and explain. \nA. Capsular polysaccharide, B. C- Carbohydrate antigen, C. Pneumolysin, D. Autolysin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Autolysin is amidase enzyme that cleaves peptidoglycan leading to autolysis of cells.\xa0\nThis property is responsible for carrom coin appearance of pneumococcal colonies.', 'role': 'assistant'}]