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: Surgery
Secondary amyloidosis occurs in ? 
Select and explain. 
A. Chronic osteomyelitis, B. Rheumatoid ahritis, C. Leprosy, D. All
D: All
Answer: D: All 
Explanation: Ans. Three options are correct i.e., 'a, b & c'