Which feature enables the mammalian kidney to concentrate urine in the medullary region?

Human urine as compared to human blood is

If the kidneys fail to reabsorb water,what will be the effect on the tissues?

Henle's loop of nephron plays a significant role in maintaining a high osmolarity in

Assertion : In the descending limb of the loop of Henle,the urine is hypertonic,whereas in the ascending limb of the loop of Henle,the urine is hypotonic.
Reason : The descending limb is impermeable to sodium,while the ascending limb is impermeable to water.

Given below are two statements with respect to counter current mechanism.
$Statement-I$: Tissue fluid around the descending limb of Henle's loop becomes concentrated, during the counter current mechanism.
$Statement-II$: Water moves out from the descending limb of Henle's loop into the tissue fluid by osmosis.
In the light of the above statements, select the correct option from the codes given below: