Assertion: In the descending limb of loop of Henle the urine is hypotoonic, while in ascending limb of loop of Henle, the urine is hypertonic.
Reason: Descending limb is impermeable to water while ascending limb is impermeable to `Na^(+)`

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertin, then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertin, then mark (2)
C. If Assertion is true statement but Reason is false, then mark (3)
D. If both Assertin and Reason are false statements, then mark (4)

Answer

A