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': 'These ventral spinal rootlets are more prone to injury during decompressive operations because they are shorter and exit in a more horizontal direction \nSelect and explain. \nA. C5, B. C6, C. C7, D. T1', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Due to rostral shift of the spinal cord during development, the spinal nerve roots become progressively oblique from above downwards.\nIn upper cervical region, the spinal nerve roots are short and run almost horizontally but the roots of the lumbar and sacral nerves are long and run almost vertically.', 'role': 'assistant'}]