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
Rugger jersey spine is seen in: 
Select and explain. 
A. Myeloma, B. TB spine, C. CRF, D. Ankylosing spondylitis
C: CRF
Answer: C: CRF 
Explanation: Answer is C (CRF): The Rugger Jersey spine refers to band like osteosclerosis of the superior and inferior margin of the veical body. Rugger Jersey Spine is characteristically seen in chronic renal failure due to secondary hyperparathyroidism or Renal osteodystrophy.