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': 'Pneumococcus can be differentiated from streptococcus by - \nSelect and explain. \nA. Type of hemolysis, B. Gram staining, C. Growth characteristics, D. Bile solubility', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]