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: Unknown
[{'content': 'All are true about iliolumbar ligament, except \nSelect and explain. \nA. Attached to transverse process of L4, B. Lower part attached to sacrospinous ligament, C. It is attached to iliac crest, D. Superiorly continuous with thoracolumbar fascia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref. Gray’s anatomy.\xa0 41st edition. Page. 1090\n\xa0\nIlio-Lumbar Ligament:\nThe portion of the iliolumbar ligament originating from the L-5 transverse process is made up of two bands (anterior and posterior).\nThe anterior band is broad and flat and has two different anatomic varieties. \n\nType 1 originates from the anterior aspect of the inferolateral portion of the L-5 transverse process and fans out widely before inserting on the anterior portion of the iliac tuberosity.\nType 2 originates anteriorly, laterally, and posteriorly from inferolateral aspect of the L-5 transverse process and fans out before inserting on the anterior portion of the iliac tuberosity.\n\n\xa0It is probable that the spatial disposition of the iliolumbar ligament influences its antitorsional role\nOrigin: transverse process of L5\ninsertion: deep into ventral margin of iliac crest 6-7cm from midline\nThe main part of ILL originates from L5 transverse processes. insert was shield by crest dorsally,making it inaccessable to palpation.', 'role': 'assistant'}]