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': 'Vaccination is based on the principle of- \nSelect and explain. \nA. Agglutination, B. Phagocytosis, C. Immunologic Memory, D. Clonal Detection', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Immunologic Memory . Vaccination is based on the principle of immunogenic memory. . The principle of vaccination against disease is that the introduction of small amount of pathogen to the body produces protective immunologic memory such that if the pathogen is reintroduced at a later date, a greater immunologic responce is elicited but without disease.", 'role': 'assistant'}]