This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cellular Pathology, Subject name: Pathology
[{'content': 'Which among the following is the hallmark of acute inflammation? \nSelect and explain. \nA. Vasoconstriction, B. Stasis, C. Vasodilation and increase in permeability, D. Leukocyte margination', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans, (c) Vasodilation and increase in permeabilityRef: Robbins pathology 9th ed. 173* Hallmark of acute inflammation is increased vascular permeability leading to the escape of protein-rich exudate into the extravascular tissue, causing edema.', 'role': 'assistant'}]