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': 'Dislocation of the vertebra is uncommon in thoracic region because in this region - \nSelect and explain. \nA. The articular process are interlocked, B. The vertebral body is long, C. Anterior longitudinal ligament is strong, D. Spinous process is long and pointed', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]