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
Active immunity is not acquired by ? 
Select and explain. 
A. Infection, B. Vaccination, C. Immunoglobulin transfer, D. Sub-clinical infection
C: Immunoglobulin transfer
Answer: C: Immunoglobulin transfer 
Explanation: 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.