Choose the correct description for the given relation.
Knot : Watt : Fathom
The terms are used by sailors,
The terms are used for installing electricity.
The terms are connected with rope.
They are units of measurement.
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Aeroplane : Cockpit : : Train : ?
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Fly : Bee : Ant
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Utopia : English
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Given set : $(9,15,21)$
Choose the correct alternative for the given relation.
Influenza : Virus : : Typhoid : ?