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: Pathology
[{'content': 'The most radiosensitive tissue is - \nSelect and explain. \nA. Brain, B. Bone marrow, C. Thyroid, D. Liver', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Radiosensitivity of important organs in decreasing order.\nBone marrow > Testes > Ovary > Kidney > Liver > Lung > Heart > GIT (Stomach > Intestine) > Thyroid > Brain & spinal cord (CNS) > Skin + Cartilage > Adult bone > Vagina > Uterus.', 'role': 'assistant'}]