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: Pathology
When leukocytes are arranged along the endothelium of blood vessels it is called - 
Select and explain. 
A. Diapedesis, B. Adhesion, C. Margination, D. Chemotaxis
C: Margination
Answer: C: Margination 
Explanation: Ans. is 'c' i.e., Margination