Choose the correct alternative for the given relation.
Dum Dura : Calcutta : : Palam : ?
Kerala
Delhi
Madras
Bombay
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Knife : Cut : : Axe : ?
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Curtain : Drapery
Insomnia is to Lead as Minamata is to..........
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Doctor : Diagnosis : : Judge : ?
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$8: 28 :\,: 21:$ ?