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: Radiology
[{'content': 'The least radiosensitive tissue is: \nSelect and explain. \nA. Nervous tissue, B. Bone, C. Kidney, D. Thyroid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Nervous tissue', 'role': 'assistant'}]