This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Radiology
[{'content': 'A CT scan neck showing arrow towards upper cervical vertebrae. What would be the reason? \nSelect and explain. \nA. Calcification of posterior longitudinal ligament, B. Normal CT, C. Vascular lesion, D. Cervical spine injury', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (D) Cervical spine injury # Trauma: Most common cervical spine injury fractures occurs at level of c2 and one half of injuries occurs at c6 and c7.most fatal cervical spine injuries occur in upper craniocervical junction c1 or c2.', 'role': 'assistant'}]