This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
All are primary colours except: September 2005 
Select and explain. 
A. Green, B. Blue, C. Red, D. White
D: White
Answer: D: White 
Explanation: Ans. D: WhiteThe primary colors normally are red, green, and blue. Because white colour, spectral colour or even extraspectral colour can be produced after mixing them in various propoions.