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: Physiology
Which of the following ours filtration at the aeriolar end of the capillary bed. 
Select and explain. 
A. Decrease in hydrostatic pressure of capillaries, B. Increase in hydrostatic pressure of capillaries, C. Increase in oncotic pressure of capillaries, D. Decrease in oncotic pressure of interstitium
B: Increase in hydrostatic pressure of capillaries
Answer: B: Increase in hydrostatic pressure of capillaries 
Explanation: The rate of filtration at any point depend on 1)Hydrostatic pressure gradient(Hydrostatic pressure of capillaries-hydrostatic pressure of interstitium) 2)Osmotic pressure gradient Net filtration pressure = Hydrostatic pr.gradient-Osmotic pr.gradient So increase in hydrostatic pressure of capillaries ours filtration at the aeriolar end of the capillary bed. Ref :Chapter 37. Renal Function & Micturition. In Barrett K.E., Boitano S, Barman S.M., Brooks H.L. (Eds), Ganong's Review of Medical Physiology, 24e.