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: Microbiology
[{'content': 'Specific immunological unresponsiveness is called tolerance. Which one of the following statements best describes immunological tolerance- \nSelect and explain. \nA. Immunologic maturity of the host does not play a major role, B. It occurs only with polysaccharide antigens, C. It is related to the concentration of antibody, D. It is prolonged by administration of immuno-suppressive drugs', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]