Which traditional prefix in a five-digit PLU code historically denoted a genetically modified (GMO) product?
Answer
A prefix beginning with an '8'
While the use and standardization of this particular prefix have reportedly become less consistent in recent years, the historical convention for PLU coding included a specific identifier for genetically modified organisms (GMOs). When a PLU code consisted of five digits and started with the number '8', it traditionally signaled that the associated fruit or vegetable had been genetically modified. This contrasts sharply with the prefix '9', which is reserved for organically grown items, and the '3' or '4' prefixes used for conventionally farmed produce, providing distinct markers for cultivation methods.

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