This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, 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 (Ref: Ananthanarayan, 9th/e, p. 82 - 83 and 8th/e, p. 86, 87)* Immunoglobulin transfer gives passive immunity.* Rest of the other options are examples of active immunity.", 'role': 'assistant'}]