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: Ophthalmology
[{'content': 'Most common type of colour blindness is: \nSelect and explain. \nA. Protanopes, B. Deuteranopes, C. Tritanopes, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Protanopes', 'role': 'assistant'}]