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 oil the knocker

To do a work with increased pace
To instigate a person to do a job
To revive old enmity
To tip the office-boy

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Idiom
Select the correct statement about active and passive immunity.

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
A vaccination is an example of the introduction of passive immunity into the body

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