203.2c The five colors are white, blue, black, red, and green. The white mana symbol is represented by {W}, blue by {U}, black by {B}, red by {R}, and green by {G}.
Example: An object with a mana cost of {2}{W} is white, an object with a mana cost of {2} is colorless, and one with a mana cost of {2}{W}{B} is both white and black.
203.2d If a player is asked to choose a color, he or she must choose one of the five colors. “Multicolored” is not a color.
Color
The only colors in the Magic game are white, blue, black, red, and green. An object can be one or more of those colors or it can be colorless. “Colorless” isn’t a color; neither are “artifact,” “land,” “brown,” “gold,” and so on. See rule 203.2.
An object’s color is determined by the color(s) of the mana symbols in its mana cost. A hybrid mana symbol is each of its component colors.
Effects may change an object’s color. If an effect gives an object a new color, the new color replaces all previous colors the object had.
Also, this kind of question comes up all the time, it's not a dumb question.
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Also, this kind of question comes up all the time, it's not a dumb question.