The glomerulus is derived from?
A. Renal cortex
B. Renal medulla
C. Renal vein
D. Renal artery

Hint: A network of small blood vessels (capillaries) known as a tuft, located at the beginning of a nephron in the kidney is called the glomerulus.

Complete answer: Renal cortex: The outer portion of the kidney is the renal cortex. It is between the renal capsule and the renal medulla.
It contains the renal corpuscles and the renal tubules except for parts of the loop of Henle which descend into the renal medulla. It also contains blood vessels and cortical collecting ducts. In the renal corpuscle, glomerulus is present. It is a tuft of capillaries composed of endothelial cells, and a glomerular capsule known as Bowman's capsule.
Renal medulla: The innermost part of the kidney is the renal medulla.
It is split up into a number of sections, known as the renal pyramids.
The renal medulla contains the structures of the nephrons. It is responsible for maintaining the salt and water balance of the blood.
Renal vein: In front of the corresponding renal artery there lies the renal veins.
The right renal vein receives tributaries exclusively from the kidney, while the left renal vein receives blood from a number of other organs.
Renal artery: The blood carried from the heart to the kidneys is done by the renal artery. Renal arteries take a very large volume of blood to the kidneys to be filtered.

Additional information: Ultrafiltration occurs in the renal cortex of the kidney.
1. Erythropoietin is produced in the renal cortex.
2. The renal medulla is hypertonic to the filtrate in the nephron and aids in the reabsorption of water.
3. The Renal vein carries the blood filtered by the kidney and connects the kidney to the inferior vena cava.

So, the answer is A. renal cortex

Note: Glomerular filtration is the first step of urine filtration.
It filtrates the excess fluid and waste products from our body and it takes place in the kidney.