What nuclear process creates carbon in the core of a low or intermediate mass star reaching red giant status?

Answer

The triple-alpha process

When the inert helium core of a red giant reaches approximately 10^8 K, helium nuclei begin to fuse into carbon via the triple-alpha process.

What nuclear process creates carbon in the core of a low or intermediate mass star reaching red giant status?
Elementastronomycompositionstargiant