This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Renal physiology, Subject name: Physiology
Which of the following causes increase in both GFR and renal plasma flow? 
Select and explain. 
A. Increased plasma colloid osmotic pressure, B. Dilatation of afferent aerioles, C. Constriction of afferent aerioles, D. Increased tubular pressure
B: Dilatation of afferent aerioles
Answer: B: Dilatation of afferent aerioles 
Explanation: Glomerular filtration rate (GFR) is the volume of fluid filtered from the renal (kidney) glomerular capillaries into the Bowman&;s capsule per unit time.Renal plasma flows (RPF) the amount of plasma that perfuses the kidneys per unit time. Approximately 90% of the total constitutes the effective renal plasma flow, the poion that perfuses functional renal tissue, such as the glomeruli.Ref: Ganong&;s review of medical physiology; 24th edition; page no; 680