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
[{'content': 'Occult fracture of neck femur are best diagnosed by: \nSelect and explain. \nA. Bone Scan, B. MRI, C. X- Ray, D. CT scan', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. MRI If the initial x - rays are normal but pain persists, the patient still should be examined for a suspected femoral neck fracture (occult fracture) T1 weighted MRI performed with in 24 hours is more sensitiveQ (100% sensitivity) than that of bone scan performed 72 hours after admission (93% sensitivity). Traditionally, bone scans has been thought to be unreliable before 48 - 72 hours after fracture. Because bone scans must be delayed for upto 72 hours in older patients with osteopenia to ensure accurate diagnosis; MRI is preferred to obtain an earlier diagnosis and shoen the hospital stay.', 'role': 'assistant'}]