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
Radiological factors indicating an unstable pelvis are all except 
Select and explain. 
A. 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.
D: Isolated disruption of pubic symphysis with pubic diastasis of 2 cm.
Answer: D: Isolated disruption of pubic symphysis with pubic diastasis of 2 cm. 
Explanation: ref : maheswari 9th ed