This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neck Triangles and parotid gland, Subject name: Anatomy
[{'content': "All are true about Sibson's fascia EXCEPT \nSelect and explain. \nA. Attached to inner border of first rib, B. Covers supraclavicular pa of lung, C. Modified inner pa of scalenus anterior, D. Attached to transverse process of C7", 'role': 'user'}, {'content': "Answer: C \nExplanation: Sibson's fascia is a modification of the endothoracic fascia in the supraclavicular region, covering the thoracic inlet. It is a degenerated tendon of scalenus minimus. Attachment : Transverse process of C7 veebra and inner border of 1st rib. It separates the subclan aery and vein ( running on the posterio superior surface of the first rib) from the cervical pleura.", 'role': 'assistant'}]