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
First to appear in acute inflammation is ? 
Select and explain. 
A. Vasodilatation, B. Increased vascular permeability, C. Vasoconstriction, D. Decreased vascular permeability
A: Vasodilatation
Answer: A: Vasodilatation 
Explanation: The sequence of events in acute inflammation is: Transient vasoconstriction ---- Vasodilatation ----- Increased permeability followed by Stasis Reference: Robbins and Cotran Pathologic Basis of Disease; 9th edition.