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
Virulence factor of gonococci Includes all except 
Select and explain. 
A. Outer membrane protein, B. IgA1 Protease, C. M Protein, D. Transferrin
C: M Protein
Answer: C: M Protein 
Explanation: M Protein is a virulence factor produced by Streptococcus.