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': 'Histamine causes all except - \nSelect and explain. \nA. Aeriolar dilatation, B. Increased permeability of venules, C. Constriction of large aeries, D. Platelet aggregation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Histamine causes aeriolar dilation rapidly increases vascular permeability by inducing venular endothelial contraction formation of inter-endothelial gaps endothelial activation ref robbins pathology 9thed page 45', 'role': 'assistant'}]