<prompt> All of the following are examples of primary colours, EXCEPT:RedGreenBlueNone of the above  <response>: The sensation of white, any spectral color, and even the extraspectral color, purple, can be produced by mixing various propoions of red light wavelength 723-647 nm, green light 575-492 nm, and blue light 492-450 nm. which are therefore called the primary colors. Ref: Ganongs Review of Medical Physiology 23rd edition, Chapter 12. 