What were the original colors represented in the sections in a Trivial Pursuit game?

Trivial Pursuit is a board game from Canada in which winning is determined by a player's ability to answer general knowledge and popular culture questions.

The object of the game is to move around the board by correctly answering trivia questions. Questions are split into six categories, with each one having its own color to readily identify itself; in the classic version of Trivial Pursuit, these are Geography (blue), Entertainment (pink), History (yellow), Arts & Literature (originally brown, later purple), Science & Nature (green), and Sports & Leisure (orange). The game includes a board, playing pieces, question cards, a box, small plastic wedges to fit into the playing pieces, and a die.

Once a player has collected one wedge of each color and filled up his playing piece, he must return to the hub and answer a question in a category selected by the other players. If this question is answered correctly, that player wins the game. Otherwise, the player must leave the center of the board and try again on the next turn.