Idiom
For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given or underlined in the sentence. A close shave

A clean shave
A narrow escape
A lucky escape
A well guarded secret

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Idiom
Select the correct statement about active and passive immunity.

Immunological memory is established by passive immunization
Active and passive humoral immunity are both mechanisms of adaptive immunity that useantibodies
A vaccination is an example of the introduction of passive immunity into the body
The antibodies utilized in active immunity are acquired from another organism

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