This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Major fibril protein in Primary Amyloidosis is - 
Select and explain. 
A. AL, B. AA, C. Transthyretin, D. Procalcitonin
A: AL
Answer: A: AL 
Explanation: pathology text book harshmohan 7th edition. *AA-secondary amyloidosis. *transthyretin- heeditory neuropathic amyloidosis. *procalcitonin-endocrine amyloidosis.