This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Physiology, Subject name: Physiology
[{'content': 'Where does the transmigration of WBCs occur in response to infectious agents? \nSelect and explain. \nA. Aerioles, B. Lymphatic ducts, C. Venules, D. Inflamed aeries', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Transmigration of WBCs occurs through pas of the vasculature that have very thin walls and minimal vascular smooth muscle layers. This includes capillaries and venules.', 'role': 'assistant'}]