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. To hold somebody to ransom

To blackmail and extract money
To offer bribe
To keep captive and demand concession
To humiliate

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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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