This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Histamine causes \nSelect and explain. \nA. Hypeension, B. Vasoconstriction, C. Vasodilation, D. Tachycardia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ref Robbins 7/e p64;9/e p73 As pa of an immune response to foreign pathogens, histamine is produced by basophils and by mast cells found in nearby connective tissues. Histamine increases the permeability of the capillaries to white blood cells and some proteins, to allow them to engage pathogens in the infected tissues.', 'role': 'assistant'}]