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for example , an underactive thyroid gland entitles the patient to free prescriptions for any medical condition for life , while an overactive thyroid gland does not
er enghraifft , y mae gan glaf sydd â chwarren thyroid tanweithredol yr hawl i gael presgripsiynau am ddim ar gyfer pob cyflwr meddygol am oes , ond nid oes gan glaf sydd â chwarren thyroid gorweithredol yr un hawl