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
[{'content': 'Which is the most important adhesion molecule for diapedesis? \nSelect and explain. \nA. CD34, B. CD 31, C. P-selection, D. E-selection', 'role': 'user'}, {'content': 'Answer: B \nExplanation: CD 31 (PECAM-1) (Platelet endothelial cells adhesion molecule) - It is most important adhesion molecule for Diapedesis. It helps in leukocyte migration through endothelium.', 'role': 'assistant'}]