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: Medicine
A 45-year-old man, known case of chronic renal failure develops rugger jersey spine. The probable cause it - 
Select and explain. 
A. Aluminium intoxication, B. Secondary hyperparathyroidism, C. Osteoporosis, D. Osteomalacia
B: Secondary hyperparathyroidism
Answer: B: Secondary hyperparathyroidism 
Explanation: None