Idiom
Select the correct statement about active and passive immunity.

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

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Idiom
To play second fiddle

To reduce importance of one's senior
To do back seat driving
To be happy, cheerful and healthy
To support the role and view of another person
None of these

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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. Get down to brass tacks

Begin to talk in plain, straight forward terms
Get into the thick of a problem
Begin to discuss secret matters
Start unravelling the mystery

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