This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pelvis and Hip injuries, Subject name: Orthopaedics
[{'content': 'Radiological factors indicating an unstable pelvis are all except \nSelect and explain. \nA. Posterior sacroiliac complex displacement by > 1 cm, B. Avulsion fracture of sacral or ischial end of the sacrospinous ligament, C. Avulsion fractures of the L5 transverse process, D. Isolated disruption of pubic symphysis with pubic diastasis of 2 cm.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: ref : maheswari 9th ed', 'role': 'assistant'}]