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': 'Following organ is LEAST radiosensitive to the effects of exposure to radiation: \nSelect and explain. \nA. Testis, B. Bone marrow, C. Muscle, D. Intestine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]