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: Medicine
Primary causes of non-inflammatory edema include all of the following except: September 2009 
Select and explain. 
A. Increased intravascular pressure, B. Decreased vascular permeability, C. Obstruction of lymphatics, D. Reduced plasma colloid oncotic pressure
B: Decreased vascular permeability
Answer: B: Decreased vascular permeability 
Explanation: Ans. B: Decreased vascular permeability Edema is caused by: Decreased plasma osmotic pressure Increased hydrostatic pressure Increased permeability of vascular endothelium Lymphatic obstruction