**Core Concept**
Continuous renal replacement therapy (CRRT) is a type of renal replacement therapy used in critically ill patients, particularly those with acute kidney injury (AKI) or severe fluid overload. It involves the continuous removal of waste products and excess fluids from the blood using a dialyzer.

**Why the Correct Answer is Right**
The indications of CRRT include severe fluid overload, acute kidney injury (AKI), liver failure with coagulopathy, and multiple organ failure. CRRT is particularly useful in patients who are hemodynamically unstable and cannot tolerate intermittent hemodialysis. The continuous and gentle removal of waste products and excess fluids helps to prevent further complications and improves patient outcomes.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not a correct indication of CRRT.
**Option B:** This option is not a correct indication of CRRT.
**Option C:** This option is not a correct indication of CRRT.

**Clinical Pearl / High-Yield Fact**
CRRT is often used in patients with a high creatinine clearance (CrCl) of less than 20 mL/min or in those with a need for fluid removal exceeding 500 mL/hour. It is essential to assess the patient's fluid status and renal function before initiating CRRT.

**Correct Answer:** D.