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: Orthopaedics
[{'content': '60 year old women suffers a fall, lower limb is extended and externally rotated likely diagnosis \nSelect and explain. \nA. Acetabular fracture, B. Posterior dislocation of Hip, C. Fracture neck femur, D. Fracture shaft of femur', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]