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
During the early stages of the inflammatory response, histamine induced increased vascular permeability is most likely to occur in: 
Select and explain. 
A. Arteries, B. Precapillary arterioles, C. Capillaries, D. Postcapillary venules
D: Postcapillary venules
Answer: D: Postcapillary venules 
Explanation: Acute inflammation causes fluid and cells to leak out of blood vessels into the interstitial tissue because of increased permeability of postcapillary venules.