question: Q:An investigator is developing a new vaccine. After injecting the agent, the immune response is recorded by measuring vaccine-specific antibodies at subsequent timed intervals. To induce the maximum immunogenic response, this vaccine should have which of the following properties?? 
  {'A': 'Foreign intact polysaccharide bound to protein', 'B': 'Chemically inactivated microorganism', 'C': 'Foreign intact polysaccharide', 'D': 'Foreign denaturated protein', 'E': 'Weakened live microorganisms'},