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': 'Stereotactic radiotherapy is used in \nSelect and explain. \nA. Miliary tuberculosis, B. Stage I lung carcinoma, C. Lymphangitis Carcinomatosa, D. Carcinoma base of tongue with positive lymph nodes', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Stage I lung carcinoma', 'role': 'assistant'}]