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
Most characteristic feature of acute inflammation is: 
Select and explain. 
A. Vasoconstriction, B. Vascular stasis, C. Vasodilatation and Increased vascular permeability, D. Margination of Leucocytes
C: Vasodilatation and Increased vascular permeability
Answer: C: Vasodilatation and Increased vascular permeability 
Explanation: Increased vascular permeability leading to the escape of protein rich fluid into the interstitium is the hallmark of acute inflammation. Ref: Robbins pathologic basis of disease 6th edn/page 53.