Which Statement About the Medullary Vertical Osmotic Gradient Is Incorrect

Multiple Choice

Which statement about the medullary vertical osmotic gradient is incorrect?

A) Juxtamedullary nephrons create the gradient through countercurrent multiplication.
B) Vasa recta supply blood to the medulla while conserving the gradient.
C) Collecting tubules of juxtamedullary nephrons, but not cortical nephrons, descend through the gradient before emptying into the renal pelvis.
D) The gradient permits excretion of urine of differing concentrations by means of vasopressin-controlled, variable H2O reabsorption from the final tubular segments.
E) None of the above statements are incorrect.