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': 'Which of the following is most susceptible to ionizing radiation? \nSelect and explain. \nA. Mature bone, B. Small lymphocytes, C. Nerve cells, D. Epithelial cells', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Tissues that have high sensitivity are lymphoid organs, bone marrow, testes, intestines, mucous\xa0membranes.\xa0\nTissues with intermediate sensitivity are ﬁne vasculature, growing cartilage & cartilage,\xa0 salivary glands, lungs, kidneys and liver.\xa0\nTissues with low sensitivity include optic lens, mature erythrocytes, muscle cells and neurons.', 'role': 'assistant'}]