**Core Concept**
Copper metabolism plays a crucial role in maintaining the health of various organs, particularly the liver, brain, and connective tissues. Abnormalities in copper metabolism can lead to a range of disorders, including those affecting the liver, brain, and connective tissues. These disorders are often characterized by excessive accumulation of copper in specific organs.

**Why the Correct Answer is Right**
Keshan disease is a cardiomyopathy caused by selenium deficiency, which is a separate entity from copper metabolism disorders. It is characterized by the degeneration of cardiac muscle cells, leading to heart failure. In contrast, Wilson's disease, Menke's Kinky-hair syndrome, and Indian childhood cirrhosis are all associated with abnormalities in copper metabolism. Wilson's disease is caused by a mutation in the ATP7B gene, leading to excessive accumulation of copper in the liver and brain. Menke's Kinky-hair syndrome is a rare disorder characterized by a mutation in the ATP7A gene, resulting in copper deficiency and impaired hair growth. Indian childhood cirrhosis is a liver disease associated with copper accumulation in the liver.

**Why Each Wrong Option is Incorrect**
**Option A:** Wilson's disease is a well-established disorder of copper metabolism, as it results from a mutation in the ATP7B gene.
**Option B:** Menke's Kinky-hair syndrome is also a disorder of copper metabolism, characterized by a mutation in the ATP7A gene.
**Option C:** Indian childhood cirrhosis is associated with copper accumulation in the liver, making it a disorder of copper metabolism.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that copper metabolism disorders often present with a range of symptoms, including liver disease, neurological symptoms, and connective tissue disorders. A high index of suspicion is necessary for early diagnosis and treatment.

**✓ Correct Answer: D. Keshan disease. Keshan disease is a cardiomyopathy caused by selenium deficiency.**