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
Example of artificial passive immunity? 
Select and explain. 
A. Infection, B. Mother to child, C. Vaccine, D. Readymade immunoglobulin
D: Readymade immunoglobulin
Answer: D: Readymade immunoglobulin 
Explanation: Infection - Natural active
Mother to child - Natural passive
Vaccine - Artificial active
Immunoglobulins - Artificial passive