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 cell-bodies of sympathetic preganglionic neurons are located in the \nSelect and explain. \nA. Dorsal root ganglia, B. Sympathetic chain ganglia, C. Brain stem and spinal cord, D. Thoracic and Lumbar segments of the spinal cord', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]