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': "Nelton's line is line joining \nSelect and explain. \nA. Anterior superior iliac spine and umbilicus, B. Posterior iliac spine and ischial tuberosity, C. Anterior superior iliac spine and ischial tuberosity, D. Posterior iliac spine and umbilicus", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]