This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Familial amyloidotic polyneuropathy is due to amyloidosis of nerves caused by deposition of : 
Select and explain. 
A. Amyloid associated protein, B. Mutant Calcitonin., C. Mutant transthyretin, D. Normal transthyretin
C: Mutant transthyretin
Answer: C: Mutant transthyretin 
Explanation: . Mutant transthyretin