Select the option that is related to the third letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster.
PG : DM :: GO : ?
PG ==> GPÂ ==> (G-3) (P-3)Â ==>Â DM
GO==> OG ==>Â (O-3)Â (G-3)Â ==> LD
So 'LD' will come in place of the question mark.
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