Cortex
The central core has 5 regions which helps to regulate the basic life processes.
The inner core.
Core is defined as "the central or innermost part."
It has a core of thestral tail hair.
Expostition
3
core
The nucleus.
A boil usually has a visible central core of pus; a carbuncle is larger and has several visible heads.
The layers of the Earth go as such: Crust --> Mantle --> Outer Core --> Inner Core
It would be C. central atomic core. Nucleus is always found at the center of the atom. This is not always the case for nucleus in the cells.