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': 'Active immunity is not acquired by ? \nSelect and explain. \nA. Infection, B. Vaccination, C. Immunoglobulin transfer, D. Sub-clinical infection', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Immunoglobulin transfer Acquired immunity is of two types :? 1) Active immunity . It is so called because host's immune system actively produce immunity. . Antigenic stimulus induces the immune system to produce antibodies or cellular immune response. 2) Passive immunity . It is so called because antibodies are produced in another organism and then received passively by the host.", 'role': 'assistant'}]