This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemical mediators in plasma: Kinin system, Subject name: Pathology
The role of bradykinin in process of inflammation is: 
Select and explain. 
A. Vasoconstriction, B. Bronchodilation, C. Smooth muscle relaxation, D. Increased vascular permeability
D: Increased vascular permeability
Answer: D: Increased vascular permeability 
Explanation: Functions of Bradykinin: 1. Increases vascular permeability 2. Contraction of smooth muscles 3. Dilation of the blood vessels 4. Pain when injected into the skin Out of these actions of bradykinin, the increase in vessel permeability is a better answer as it is the hallmark of acute inflammation.