if the person was placed for adoption by an adoption agency, that agency or (if different) the agency that holds the records in relation to the adoption;
os cafodd y person ei leoli i'w fabwysiadu gan asiantaeth fabwysiadu, yr asiantaeth honno neu (os yw'n wahanol) yr asiantaeth sydd ym meddiant y cofnodion mewn perthynas â'r mabwysiad