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

Eugenics
Euthenics
Ecology
Etiology

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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. To leave someone in the lurch

None of these
Constant source of annoyance to someone
To put someone at ease
To come to compromise with someone
To desert someone in his difficulties

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