This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Spinal Injuries, Subject name: Orthopaedics
[{'content': 'The following X-ray was taken of a 50-year-old female with chronic backache. What is the most likely diagnosis? \nSelect and explain. \nA. Spondylolysis, B. Spondylosis, C. Spondylolisthesis, D. Prolapsed inter-vertebral disc', 'role': 'user'}, {'content': 'Answer: C \nExplanation: (c)', 'role': 'assistant'}]