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: Pharmacology
The use of hyperimmune sera such as hepatitis B immune globulin, rabies immunoglobulin, and human tetanus immune globulin for prophylaxis or treatment is an example of what process? 
Select and explain. 
A. Active immunity, B. Passive immunity, C. Humoral immunity, D. Cellular immunity
B: Passive immunity
Answer: B: Passive immunity 
Explanation: The use of hyperimmune sera for treatment or prophylaxis is referred to as "passive immunization". This approach is used when allowing the development of a natural immune response would take too long and directly threaten patient survival. This type of immunity is of sho duration and has no memory component. Ref: Levinson W. (2012). Chapter 57. Immunity. In W. Levinson (Ed), Review of Medical Microbiology & Immunology, 12e.