Which statement best describes chronic renal failure?

Chronic renal failure, also known as chronic kidney disease (CKD), is characterized by the gradual loss of kidney function over time. This condition is irreversible, meaning that once kidney damage has occurred, it cannot be restored to normal function. Patients often experience a progressive decline in renal function, which can lead to complications affecting various bodily systems.

In contrast, the other statements do not accurately reflect the nature of chronic renal failure. It is not temporary, nor does it resolve within a month, as these options suggest an acute and transient issue rather than a chronic one. Furthermore, the claim about instant kidney recovery is inconsistent with the understanding of chronic renal failure, where kidney function diminishes chronically and requires ongoing management and possibly dialysis or kidney transplantation in advanced cases.