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
In acute inflammation, excessive fluid seepage occurs due to increased permeability of? 
Select and explain. 
A. Venules, B. Capillaries, C. Arterioles, D. Arterioles and capillaries
A: Venules
Answer: A: Venules 
Explanation: Postcapillary venules are an important point of interchange between the Lumen of the vessels and the surrounding tissue. Moreover, both vascular leakage and Leukocyte exudation occur preferentially in venules in many types of inflammation.
Increased vascular permeability is the hallmark of acute inflammation.