Microbiology Specific immunological unresponsiveness is called tolerance. Which one of the following statements best describes immunological tolerance- A 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 💡 Explanation Specific immunological unresponsiveness is called tolerance. Which one of the following statements best describes immunological tolerance- ✓ Correct Answer: D. It is prolonged by administration of immuno-suppressive drugs