Choose the odd one out from the given four choices.

One way to classify colours is by checking whether each is one of the seven spectral (rainbow) colours produced when white light is split by a prism — the sequence Violet, Indigo, Blue, Green, Yellow, Orange, Red (VIBGYOR). White itself is not a spectral colour; it is what results when the full range of visible wavelengths is combined together.

Among the given options, Blue, Green, and Yellow are each one of these seven spectral colours. White, however, is the combination of all the spectral wavelengths and is not itself one of them, so it does not share the property the other three share.

• Blue — one of the seven spectral (rainbow) colours.

• Green — one of the seven spectral (rainbow) colours.

• Yellow — one of the seven spectral (rainbow) colours.

So White is the odd one out, since it is not a spectral colour while the other three are.