Find the odd number / letters / word from the given alternative:

Green
Pink
Indigo
Violet

The odd one out is B. Pink.

The other three options, A. Green, C. Indigo, and D. Violet, are all colors of the rainbow. Pink is not a color of the rainbow.

The rainbow is a spectrum of light that is visible to the human eye. It is made up of seven colors: red, orange, yellow, green, blue, indigo, and violet. Pink is not one of these colors.

Pink is a mixture of red and white. It is a secondary color, which means that it is made by mixing two primary colors. The primary colors are red, yellow, and blue.

Pink is often associated with femininity and romance. It is also the color of many flowers, such as roses and carnations.