Along the lines of:

 my $Return_results = "Select * from Result_storage_keep where Unique_
+identifier LIKE ".$Request_id." AND Aggregated_area = Instance_name A
+ND Disease_cat = Cause_catagory\;";

  my $sth_C = $dbh->prepare($Return_results) or die "Couldn't prepare 
+query: ".$dbh->errstr;
  
  $sth_C->execute() or die "Couldn't execute query: ".$sth_C->errstr;
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Yes