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
[{'content': 'Most impoant adhesion molecule for diapedesis \nSelect and explain. \nA. PECAM, B. Selectin, C. Integrin, D. Mucin like glycoprotien', 'role': 'user'}, {'content': 'Answer: A \nExplanation: CD31 or PECAM-1 (platelet endothelial cell adhesion molecule). is the most impoant molecule for diapedesisRobbins 9the p.76 -77', 'role': 'assistant'}]