Which of these begins first in the core of a massive star?

Question

Quizplus · Accepted Answer

Hydrogen fusion to helium is the first fusion reaction that occurs in the core of a massive star. This is because the core temperature and pressure are only high enough to sustain this reaction. Once the hydrogen fuel is exhausted, the core contracts and heats up, allowing helium fusion to occur. This process continues with heavier elements until iron is produced, which cannot be fused further without an input of energy.

Which of These Begins First in the Core of a Massive