Which of the following diagrams is correct with regard to the proximal $(P)$ and distal $(D)$ tubule of the Nephron?

Urea enters the nephron through . . . . . . .
$i$. Thicker segment of ascending limb of Henle's loop.
$ii$. Thinner segment of ascending limb of Henle's loop.
$iii$. Ultrafiltration into urinary space.
$iv$. Inner medullary segment of collecting tubule.
$v$. Outer medullary segment of collecting tubule.
Select the correct option.

Diuresis is a condition characterized by:

The primary function of the kidney is ........ .

Substance	Glomerular filtrate	Reabsorbed	Urine
$(i)$ Proteins	$2 \,g$	$1.9 \,g$	$0.1 \,g$
$(ii)$ Glucose	$162 \,g$	$162 \,g$	$0 \,g$
$(iii)$ Urea	$54 \,g$	$24 \,g$	$30 \,g$
$(iv)$ Creatinine	$1.6 \,g$	$0 \,g$	$1.7 \,g$

$(a)$ Glucose is completely reabsorbed.
$(b)$ Urea is partially reabsorbed.
$(c)$ Proteins are secreted into urine.
$(d)$ Creatinine is secreted into urine.
Which of the following options,in view of the above statements,is correct?

Urine becomes cloudy when: