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': 'A 60- years old man fell in the bathroom and was unable to stand, on right buttock region ecchymosis with external rotation of the leg and lateral border of foot touching the bed. The most probable diagnosis is - \nSelect and explain. \nA. Extracapsular fracture neck of femur, B. Anterior dislocation of hip, C. Intracapsular fracture neck of femur, D. Posterior dislocation of hip', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lateral border of foot touching the bed, that means there is extreme external rotation.\nThis occurs in extracapsular neck fracture (basal / basicervical) and IT fractures.', 'role': 'assistant'}]