In this task, you will be shown a sentence, and you should determine whether it is overruling or non-overruling. In law, an overruling sentence is a statement that nullifies a previous case decision as a precedent by a constitutionally valid statute or a decision by the same or higher ranking court which establishes a different rule on the point of law involved. Classify your answers into overruling or non-overruling
Q: we answer the certified question in the negative, quash the district court's opinion, and disapprove gellert to the extent of conflict with this opinion, but we approve the result of the instant case.
A: 
overruling