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
Diapedesis is : 
Select and explain. 
A. Immigration of leucocytes through the basement membrane, B. Immigration of the leucocytes through the vessel wall to the site of inflammation, C. Aggregation of platelets at the site of bleeding, D. Auto digestion of the cells
B: Immigration of the leucocytes through the vessel wall to the site of inflammation
Answer: B: Immigration of the leucocytes through the vessel wall to the site of inflammation 
Explanation: . Immigration of the leucocytes through the vessel wall to the site of inflammation