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 of the following are true about Sibson's fascia except \nSelect and explain. \nA. Attached to cervical pleura, B. Arises from scalenus anterior, C. Subclavian arched over it, D. Attached to C7", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ref. Gray’s anatomy.\xa0 41st edition. Page. 446,896.\nTopic, Subtopic – Thorax, fascia\nSibson's Fascia:\nThe\xa0suprapleural membrane, also known as\xa0Sibson fascia,\xa0is a dense fascial layer that is attached to the inner border of the\xa0first rib\xa0and\xa0costal cartilage\xa0anteriorly,\xa0C7\xa0transverse process posteriorly and to the mediastinal\xa0pleura\xa0medially.\n\nIt is flat and lies in the oblique plane of the\xa0thoracic inlet,\xa0with a cervical dome of pleura attached to its under surface.\nLying on it are the subclavian vessels and other structures in the root of the neck.\nThe function of the membrane is to provide rigidity to the\xa0thoracic inlet\xa0that prevents distortion due changes in intrathoracic pressure during respiration.", 'role': 'assistant'}]