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': 'Streptococcus is classified based on - \nSelect and explain. \nA. M protein, B. Cultural characteristics, C. Bile solubility, D. Cell wall carbohydrate', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Cell wall carbohydrate", 'role': 'assistant'}]