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: Surgery
Pain in varicose vein is due to all except 
Select and explain. 
A. Increased venous wall tension, B. Increased capillary permeability, C. Hyperviscosity of RBCs, D. Hypoxia of tunica media of venous wall
B: Increased capillary permeability
Answer: B: Increased capillary permeability 
Explanation: In varicose veins, there is decreased capillary permeability causing capillary functional disorder.