Oliguria is usually correlated with which condition?

Oliguria, defined as a urine output of less than 400 mL per day in adults, is often associated with conditions that impair kidney function or blood flow to the kidneys. Acute glomerulonephritis is an inflammatory condition of the glomeruli, the filtering units of the kidneys, which can lead to a significant decrease in urine production. This inflammation disrupts the normal filtration process, causing reduced kidney function and resulting in oliguria.

In contrast, conditions such as chronic kidney disease often result in a gradual decrease in kidney function over time, which may ultimately lead to oliguria but is not typically characterized by a sudden onset of decreased urine output. Urinary tract infections may lead to other symptoms and complications but are not primarily associated with oliguria. Kidney stones can cause obstruction but usually result in different urinary output levels depending on the location and severity of the blockage, rather than a definitive oliguric state.

Therefore, the association of oliguria with acute glomerulonephritis highlights the direct relationship between kidney inflammation and decreased urine production, making this the correct choice in this context.