<prompt> A 70 year old male , known case of chronic renal failure suffers from a pathological fracture of Rt femur, the diagnosis isPrimary HrperparathyroidismSecondary HyperparathyroidismScurvyVitamin D Resistant rickets  <response>: Answer- B. Secondary HyperparathyroidismIn CRF there is secondary hyperparathyroidism which causes pathological fracture. 