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: Anatomy
[{'content': 'The occipital bone provides attachment to all except: \nSelect and explain. \nA. Trapezi us, B. Ligamentum nuchae, C. Sternocleidomastoid, D. Rectus capitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]