What is the Sixth catogary added in 1968 of nobel prize?

The sixth category added to the Nobel Prize in 1968 is the Nobel Prize in Economics, officially called the Sveriges Riksbank Prize in Economic Sciences in Memory of Alfred Nobel.

It's important to note that it's not technically a Nobel Prize as it was established by the Swedish central bank, Sveriges Riksbank, and not by the Nobel Foundation. However, it's often referred to as a Nobel Prize due to its close association and similar prestige.