The given figure shows the human excretory system with parts labeled $A$ to $D$. Select the option that correctly identifies these parts and describes their characteristics or functions.

• A
  $D$ - Cortex - It is the outer part of the kidney and does not contain any parts of the nephrons.
• B
  $A$ - Adrenal gland - Located at the anterior part of the kidney,it secretes catecholamines which stimulate glycogen breakdown.
• C
  $B$ - Renal pelvis - $A$ broad,funnel-shaped space inside the hilum,directly connected to the loop of Henle.
• D
  $C$ - Medulla - The inner part of the kidney that contains the entire nephron structure.