What is the dominant energy generation mechanism in the main sequence phase for stars similar in size to our Sun?

Answer

The proton-proton (P-P) chain

For stars roughly the size of the Sun or smaller during their longest phase (main sequence), the conversion of hydrogen to helium is primarily driven by the proton-proton chain.

What is the dominant energy generation mechanism in the main sequence phase for stars similar in size to our Sun?
ElementastronomystarFusionnucleosynthesis