**Core Concept**
Total Parenteral Nutrition (TPN) is a life-saving intervention for patients with severe gastrointestinal dysfunction. TPN involves the administration of essential nutrients through intravenous lines, bypassing the digestive system. However, TPN can lead to various complications due to the hyperalimentation of patients.

**Why the Correct Answer is Right**
Complications of TPN can arise due to the imbalance of essential nutrients, leading to electrolyte disturbances, metabolic acidosis, and impaired liver function. These complications can be attributed to the hyperglycemia caused by the administration of glucose-containing solutions, which can lead to insulin resistance and subsequent metabolic derangements. Moreover, the lack of enteral feeding can result in atrophy of the intestinal mucosa, impairing its absorptive capacity.

**Why Each Wrong Option is Incorrect**
**Option A:** This option may be a correct complication of TPN. Metabolic bone disease is a well-documented complication of long-term TPN, characterized by osteomalacia, osteoporosis, and fractures due to the lack of enteral calcium and vitamin D absorption.

**Option B:** This option may be a correct complication of TPN. Hepatic steatosis, also known as fatty liver disease, is a common complication of TPN, particularly in patients with pre-existing liver disease. The administration of glucose-containing solutions can lead to the accumulation of triglycerides in the liver, resulting in steatosis.

**Option C:** This option is a correct complication of TPN. Cholestasis, a condition characterized by bile flow impairment, is a well-documented complication of long-term TPN, particularly in neonates. The administration of lipid emulsions can lead to the impairment of bile flow, resulting in cholestasis.

**Clinical Pearl / High-Yield Fact**
To minimize the risk of complications, TPN should be tailored to the individual patient's needs, and regular monitoring of liver function, electrolyte levels, and glucose control is essential. Additionally, the use of lipid emulsions should be judicious, and the administration of enteral feeds should be encouraged whenever possible.

**Correct Answer:** D. Metabolic bone disease.