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': 'Delayed prolonged increase in vascular permeability in inflammation is due to: \nSelect and explain. \nA. Interleukin 1 mediated endothelial retraction, B. Increased transcytosis, C. Leakage from newly formed blood vessels, D. Release of histamine causing endothelial contraction', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]