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
Rubor in inflammation is due to - 
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: Ans. is 'a' i.e., Dilation of aerioles