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
Opsonization occurs due to all except - 
Select and explain. 
A. Endotoxin, B. Complement, C. IgM, D. IgD
A: Endotoxin
Answer: A: Endotoxin 
Explanation: None