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
Toxic shock syndrome is due to the following virulence factor: 
Select and explain. 
A. M protein, B. Pyrogenic exotoxin, C. Streptolysin 0, D. Carbohydrate cell wall
B: Pyrogenic exotoxin
Answer: B: Pyrogenic exotoxin 
Explanation: None