The either/or variation is commonly referred to as a "dichotomy." A dichotomy presents a situation or concept that is divided into two mutually exclusive or contradictory options.
Example:
In literature, a classic example of a dichotomy is the moral struggle between good and evil, as seen in many stories where characters must choose between right (good) and wrong (evil). For instance, the conflict between Superman (representing good) and Lex Luthor (representing evil) is a clear dichotomy that illustrates the struggle between these two opposing forces.
Dichotomies are also used in various fields, such as philosophy (e.g., mind/body), biology (e.g., sexual reproduction/asexual reproduction), and sociology (e.g., individualism/collectivism).