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 smell a rat

None of these
To suspect foul dealings
To see signs of plague epidemic
To be in a bad mood
To get bad small of a bad dead rat

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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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