This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lower Limb Traumatology, Subject name: Orthopaedics
[{'content': 'In lower-third fractures of shaft of femur, the proximal fragment undergoes which displacement ? \nSelect and explain. \nA. Adduction, B. Abduction, C. Flexion, D. Extension', 'role': 'user'}, {'content': 'Answer: B \nExplanation: FRACTURE FEMUR Proximal 1/3rd Proximal fragment flexes, abducts and externally rotates because of gluteus medius and iliopsoas. Distal fragment is adducted due to adductors such as adductor longus, minimus and magnus Middle 1/3rd Proximal fragment abducts Distal fragment is adducted Distal 1/3rd Proximal fragment adducts Distal fragment is hyperextended by gastrocnemius', 'role': 'assistant'}]