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
Streptolysin O functionally & structurally related to -a) Tetanolysinb) Pneumolysinc) Streptolysin Sd) Clostridium perfringens O toxine) Listeriolysin 
Select and explain. 
A. abcd, B. bcde, C. abde, D. ade
C: abde
Answer: C: abde 
Explanation: None