This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Rubor in inflammation is due to - rpt Q24 
Select and explain. 
A. Dilation of aerioles, B. Increased vascular permeability, C. Increased viscocity of blood, D. Edema
A: Dilation of aerioles
Answer: A: Dilation of aerioles 
Explanation: Harshmohan textbook of pathology 7th edition. persistent progressive vasodilatation seen in acute inflammatory response due to dilatation of aerioles but to a lesser extend affect other components of micro circulation like venules and capillaries. Vasodilatation result in increased blood volume in the microvascular bed of the area which is responsible for redness/ rubor and warmth at the site of acute inflammation. .