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 and pneumococcus are differentiated by , all except \nSelect and explain. \nA. Bile salt solubility, B. Growth charcteristic, C. Gram staining, D. Inulin fermentation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]