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': 'All of the following vascular changes are observed in acute inflammation, except: \nSelect and explain. \nA. Vasodilation, B. Stasis of blood, C. Increased vascular permeability, D. Decreased hydrostatic pressure', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]