This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Extravascular Changes, Subject name: Pathology
The process of coating a microbe, to target it for phagocytosis is: 
Select and explain. 
A. Diapedesis, B. Margination, C. Chemotaxis, D. Opsonisation
D: Opsonisation
Answer: D: Opsonisation 
Explanation: Opsoniztion:- Refer to coating of microbes or self cell by antibodies, which facilitates the phagocytosis of the same cell or microbe. Chemotaxis:-It is movement or migration of cell from from one place to another, eg, Migration of Neutrophils during inflammation Diapedesis:-Passage of blood cells through the intact walls of capillaries, eg, WBC at inflammed site. PECAM-1 OR CD31 useful for diapedesis.