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': 'Live vaccine is ? \nSelect and explain. \nA. Salk polio, B. KFD, C. Sabin polio, D. Meningococci', 'role': 'user'}, {'content': 'Answer: C \nExplanation: There are 4 main types of vaccines: Live-attenuated vaccines Inactivated vaccines Subunit, recombinant, polysaccharide, and conjugate vaccines Toxoid vaccines Live-attenuated vaccines Live vaccines use a weakened (or attenuated) form of the germ that causes a disease.', 'role': 'assistant'}]