Insulin is to Hormone as Trypsin is to..........?

Grain is related to granary in the same way curios is related to...........

Choose the correct alternative for the given relation.

Bread : Yeast : : Curd : ?

Choose the correct alternative for the word belongs to the same group.

Which of the following is the same as Rabbit, Rat, Mole ?

Preface is to book as overture is to.........

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Ohm : Watt : Volt