Answer :
The factor responsible for the lifetime immunity against certain diseases like chicken pox and measles, that do not infect a person more than once is (c) the acquired immune response, because antibodies are developed from previous infections.
The acquired immune response is the specific type of immunity that develops for a certain type of pathogen. This immunity is achieved when the antibodies are received from an outside source such as vaccine. It is a more stronger type of immunity as it stays for a longer time, preferably for lifetime and also has memory.
Antibody is Y-shaped structure present inside the body. It is a compound formed to fight against any pathogen also called antigen. Antibody recognizes specific component on a pathogen and protects the body.
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