Answer: Casts are cylindrical structures that can be found in a urine specimen. They are formed by the accumulation of materials within the renal tubules, which are part of the kidneys. Therefore, the correct answer is C) Kidneys.
Step-by-step explanation:
The kidneys play a crucial role in the filtration and excretion of waste products from the bloodstream. As urine is produced in the kidneys, it passes through the renal tubules, where casts can form under certain conditions.
It is important to note that casts in the urine can indicate various health conditions and are often evaluated by medical professionals to aid in the diagnosis of kidney diseases or other urinary tract issues.
I hope this helps :)