This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'Which toxin of streptococcus cause hemolysis \nSelect and explain. \nA. Streptolysin O, B. Streptolysin S, C. Streptodornanse, D. Hyaluronidase', 'role': 'user'}, {'content': "Answer: B \nExplanation: Streptococci produces two hemolysins - streptolysin O and S. Streptolysin S is an oxygen stable hemolysin and is responsible for the hemolysis seen around streptococcal colonies on the surface of blood agar plates. It is called streptolysin S as it is soluble in serum. It is a protein but is not antigenic. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 213", 'role': 'assistant'}]