This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Orthopaedics
[{'content': 'The earliest changes for evaluation of stress fractures are seen in \nSelect and explain. \nA. Bone scan, B. Bone biopsy, C. CT scan, D. MRI', 'role': 'user'}, {'content': "Answer: D \nExplanation: Answer: d) MRISTRESS FRACTURESMay occur in the pelvis, femoral neck, tibia, navicular and metatarsals.The metatarsals are involved in 55% of cases, whereas the sesamoids and talus are involved in less than 1%Occurs d/t significant increase in training and activity (Runner's fracture).Risk factors: female athlete, poor nutrition, low bone density, and a history of menstrual disturbance.MRI or technetium bone scans are the best diagnostic tests.Treatment: rest and avoidance of high-impact activities until healing occurs.", 'role': 'assistant'}]