All of the following are examples of primary colours, EXCEPT:
Red
Green
Blue
None of the above
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: Ganong's Review of Medical Physiology 23rd edition, Chapter 12.