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
[{'content': 'Primary causes of non-inflammatory edema include all of the following except: September 2009 \nSelect and explain. \nA. Increased intravascular pressure, B. Decreased vascular permeability, C. Obstruction of lymphatics, D. Reduced plasma colloid oncotic pressure', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Decreased vascular permeability Edema is caused by: Decreased plasma osmotic pressure Increased hydrostatic pressure Increased permeability of vascular endothelium Lymphatic obstruction', 'role': 'assistant'}]