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
Streptococcus and pneumococcus are differentiated by- 
Select and explain. 
A. Bile salt solubility, B. Growth characteristic, C. Gram staining, D. all
A: Bile salt solubility
Answer: A: Bile salt solubility 
Explanation: Ans. is 'a' i.e., Bile salt solubility . Pneumococcus is bile soluble, while streptococcus is insoluble. Pneumococcus ferments inulin, streptococcus does not.