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 be at loggerheads

To tax one's mind and body
To be at enmity or strife
To face stiff opposition
To have tough encounter

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Idiom
Select the correct statement about active and passive immunity.

The antibodies utilized in active immunity are acquired from another organism
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

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