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
[{'content': 'All are primary colours except: September 2005 \nSelect and explain. \nA. Green, B. Blue, C. Red, D. White', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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.', 'role': 'assistant'}]