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
The virulence factors of Neisseria gonorrhea include all of the following except: 
Select and explain. 
A. Outer membrane proteins, B. IgA Protease, C. M-Proteins, D. Pili
C: M-Proteins
Answer: C: M-Proteins 
Explanation: None