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': 'Most "Radiosensitive" Tissue is: \nSelect and explain. \nA. Gonads, B. Bone-marrow, C. RBC, D. GIT epithelium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Bone-marrow', 'role': 'assistant'}]