A) If due to some reason B-and T-lymphocytes are damaged, the body will not produce antibodies against a pathogen
B) Injection of dead / inactivated pathogens causes passive immunity
C) Certain protozoans have been used to mass produce hepatitis B vaccine.
D) Injection of snake antivenom against snake bite is an example of active immunization
Correct Answer: A
Solution :
[a] B and T-lymphocytes produce antibodies against pathogen in the body, if due to some reason B and T-lymphocytes are damaged the body will not produce antibodies against a pathogen. Each B cell and T cell is specific for a particular antigen.
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