Final Answer:
The official state nut of Oregon is the hazelnut.
Step-by-step explanation:
Official State Nut: The question is asking about the official state nut of Oregon. In this case, the correct answer is the hazelnut.
Oregon State Recognition: The state of Oregon has officially recognized the hazelnut as its state nut. This could be due to the significant hazelnut production in the state.
Verification of Information: To verify this information, one can refer to the official state symbols or government websites of Oregon, where the designation of the hazelnut as the state nut would be documented.