Idiom
Branch of science which deal with the study of causative agent of disease is

Eugenics
Etiology
Euthenics
Ecology

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Idiom
Will o' the wisp

To act in a foolish way
Anything which eludes or deceives
To act in a childish way
To have desires unbacked by efforts

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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. At one's beck and call

Enjoying oneself without caring for others
To be under one's subjugation
To be always at one's service
To be in an advantageous position

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