**Core Concept**
Amyloidosis is a group of diseases characterized by the deposition of amyloid fibrils in various tissues, leading to organ dysfunction. Transthyretin (TTR) is a transport protein involved in the circulation of thyroxine and retinol. Mutations in the TTR gene can lead to the production of abnormal TTR proteins that aggregate and form amyloid fibrils.

**Why the Correct Answer is Right**
The correct answer is related to Familial Amyloid Polyneuropathy (FAP), a rare hereditary condition caused by mutations in the TTR gene. These mutations lead to the production of abnormal TTR proteins that are prone to aggregation and deposition in peripheral nerves and other tissues, causing progressive neuropathy and other systemic complications. The most common mutation associated with FAP is the Val30Met mutation, which affects the structure and stability of the TTR protein.

**Why Each Wrong Option is Incorrect**
**Option A:** Primary Amyloidosis (AL amyloidosis) is caused by the deposition of immunoglobulin light chains produced by plasma cells in multiple myeloma or other plasma cell dyscrasias. It is not related to TTR protein mutations.
**Option B:** Secondary Amyloidosis (AA amyloidosis) is caused by the deposition of serum amyloid A (SAA) protein, which is produced in response to chronic inflammation or infection. It is not related to TTR protein mutations.
**Option C:** Dialysis-related amyloidosis is caused by the deposition of beta2-microglobulin amyloid fibrils in patients with long-term hemodialysis. It is not related to TTR protein mutations.

**Clinical Pearl / High-Yield Fact**
Familial Amyloid Polyneuropathy (FAP) is a rare but devastating condition that affects multiple generations of a family. Early diagnosis and treatment with liver transplantation can significantly improve survival and quality of life for affected individuals.

**Correct Answer: C. Familial Amyloid Polyneuropathy**