**Question:** All of the following are features of Wilson's disease, except-

A. Kayser-Fleischer rings (PFBs)
B. Hepatic failure
C. Encephalopathy
D. Acute liver failure

**Core Concept:**
Wilson's disease is a rare autosomal recessive disorder caused by mutations in the ATP7B gene, leading to copper accumulation in the liver and brain. This results in copper overload and multiple organ dysfunction. The disease is characterized by the following features:

1. Kayser-Fleischer rings (PFBs): Transparent or golden-brown discoloration of the cornea due to copper accumulation, which is a hallmark of Wilson's disease.
2. Hepatic failure: Liver dysfunction and cirrhosis are common features in Wilson's disease, but acute liver failure is not the primary presentation or a unique feature of Wilson's disease.
3. Encephalopathy: Brain involvement is common in Wilson's disease, resulting in neurological symptoms and signs.
4. Acute liver failure: Acute liver failure is a severe complication of Wilson's disease, and it is not a unique feature of the disease.

**Why the Correct Answer is Right:**

Wilson's disease primarily presents with neurological and hepatic symptoms. Acute liver failure is a severe complication and not a unique feature of Wilson's disease. On the other hand, Kayser-Fleischer rings, hepatic dysfunction, and encephalopathy are characteristic features of Wilson's disease, making them the correct answers for this question.

**Why Each Wrong Option is Incorrect:**

A. Hepatic failure is a common feature of Wilson's disease, but it is not unique to the disease.
B. Liver failure is not a unique feature of Wilson's disease, making acute liver failure the incorrect answer.
C. Encephalopathy is a characteristic feature of Wilson's disease, making it the correct answer.
D. Acute liver failure is a severe complication of Wilson's disease, not a unique feature, making it the incorrect answer.

**Clinical Pearl:**

Kayser-Fleischer rings (PFBs) are a hallmark of Wilson's disease, representing copper accumulation in the cornea. Hepatic dysfunction, encephalopathy, and acute liver failure are common but not unique features of Wilson's disease. Understanding these features will help in differentiating Wilson's disease from other liver diseases and neurodegenerative conditions.