Which of the following colors is NOT part of the Olympic rings?

The Olympic rings consist of five interlocked rings colored blue, yellow, black, green, and red on a white background. Each color is intended to represent the colors that appeared on all national flags at the time the Olympic flag was created.

Pink, however, is not one of these colors and does not appear in the official design of the Olympic rings. Thus, it is correct to identify pink as the color that is not part of the Olympic rings.

The other colors—black, green, and red—are integral parts of the Olympic symbol and are recognized worldwide as significant elements of the Olympic Games.