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
A 70 year old male , known case of chronic renal failure suffers from a pathological fracture of Rt femur, the diagnosis is 
Select and explain. 
A. Primary Hrperparathyroidism, B. Secondary Hyperparathyroidism, C. Scurvy, D. Vitamin D Resistant rickets
B: Secondary Hyperparathyroidism
Answer: B: Secondary Hyperparathyroidism 
Explanation: Answer- B. Secondary HyperparathyroidismIn CRF there is secondary hyperparathyroidism which causes pathological fracture.