Idiom
Select the correct statement about active and passive immunity.

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

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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. Chandu used very ugly words against his kind uncle; he threw down the gauntlet before him.

he threw the challenge
he behaved as if he was very great and important person
he put several conditions for negotiation
he showed his readiness to leave the place
he abused and insulted him

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