All of the following are true regarding blood supply to the kidney, EXCEPT:

All of the following are true regarding blood supply to the kidney, EXCEPT:

A.Stellate veins drain superficial zone
B. It is a type of portal-circulation
C. The renal artery divides into five segmental arteries before entering the hilum
D. Its segmental arteries are end-arteries 

Answer is B. It is a type of portal-circulation.

Portal Circulation signifies circulation of blood from capillaries of one organ through larger vessels to capillaries of another organ before returning through larger veins to the heart. Examples include Liver and Hypophyseoportal.

• In the Kidney, there are two capillary networks viz. glomerulus and vasarecta, but they occur in the same organ (kidney). Hence, it does not satisfy the criterion of portal circulation.
• Each renal artery usually divides into 5 segmental arteries that enter the hilum of the kidney, 4 in front, and 1 behind the renal pelvis.
• Segmental arteries are end arteries with little or no anastomosis.
• Several stellate veins drain the most superficial zone of the renal cortex and converge beneath the fibrous renal capsule to drain several interlobular veins.

An interesting flash video on circulation of the kidney is here.