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
All of the following are included in the pathogenesis of oedema except? 
Select and explain. 
A. Decreased hydrostatic pressure of capillaries, B. Decreased plasma osmotic pressure of capillaries, C. lymphatic obstruction, D. Increased vascular permeability
A: Decreased hydrostatic pressure of capillaries
Answer: A: Decreased hydrostatic pressure of capillaries 
Explanation: Pathogenesis of edema
1) The increased hydrostatic pressure of capillaries
2) Decreased plasma osmotic pressure of capillaries: It causes decrease in inward driving force. It results from Hypoproteinemia. When total plasma protein is below 5 gm/dl(A 113) (normal 6-8 gm/dl) or albumin is below 2-5 gm/dl (normal 3.5-5 gm/dl) edema takes place.
3) Defective removal of interstitial fluid by lymphatics: It is due to lymphatic obstruction.
4) Increased vascular permeability
5) Sodium (salt) and water retention