Tiff is to Battle as Frugal is to........?

Rickets is to Children as Osteomalacia is to

Choose the correct alternative for the given relation.

Necessity : Invention

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Seismograph : Earthquakes : : Taseometer : ?

Choose the correct alternative for the given relation.

Leather : Milk

Choose the correct alternative for the given relation.

Food : Stomach : : Fuel : ?