This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Special Senses: Vision and its Elements, Subject name: Physiology
[{'content': 'All the following are primary colours except \nSelect and explain. \nA. Blue, B. Green, C. Red, D. Yellow', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (D) Yellow > Blue, green and red are the primary colours but the cones with their maximal sensitivity in the yellow portion of sensitive enough in red portion to respond to red light at a lower threshold than green', 'role': 'assistant'}]