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
Increased vascular permeability in acute inflammation is due to ? 
Select and explain. 
A. Histamine, B. IL 2, C. TGF beta, D. FGF
A: Histamine
Answer: A: Histamine 
Explanation: Ans. is 'a' i.e., Histamine