This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
Lymph flow is increased by all except 
Select and explain. 
A. Increased vascular permeability, B. Decreased capillary osmotic pressure, C. Increase in interstitial fluid, D. Decreased interstitial osmotic pressure
D: Decreased interstitial osmotic pressure
Answer: D: Decreased interstitial osmotic pressure 
Explanation: Any factor that increases interstitial fluid pressure also increases lymph flow if the lymph vessels are functioning normally. Such factors include the following: * Elevated capillary hydrostatic pressure * Decreased plasma colloid osmotic pressure * Increased interstitial fluid colloid osmotic pressure * Increased permeability of the capillariesAll of these factors cause a balance of fluid exchange at the blood capillary membrane to or fluid movement into the interstitium, thus increasing interstitial fluid volume, interstitial fluid pressure, and lymph flow all at the same time.