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
Which toxin of streptococcus causes hemolysis? 
Select and explain. 
A. Streptolysin O, B. Streptolysin S, C. Streptokinase, D. Streptodornase
B: Streptolysin S
Answer: B: Streptolysin S 
Explanation: None