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: Social & Preventive Medicine
[{'content': 'World bank gives loans for \nSelect and explain. \nA. Cobalt therapy of radiotherapy department, B. For economic growth, C. Purchase of microscope for tuberculosis investigation, D. To change of the social justice', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]