This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Diapedesis is 
Select and explain. 
A. Immigration of leukocytes through the basement membrane, B. Immigration of leukocytes through the endothelial gap to the site of inflammation, C. Aggregation of platelets at the site of inflammation, D. Auto-digestion of the cells
B: Immigration of leukocytes through the endothelial gap to the site of inflammation
Answer: B: Immigration of leukocytes through the endothelial gap to the site of inflammation 
Explanation: Diapedesis is immigration of leukocytes through the endothelial gap to the site of inflammation.It occurs mainly in postcapillary venules except in lung where it occurs in capillaries.Robbins 9th edition p 76