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': 'Which pathway is responsible for contrast \nSelect and explain. \nA. Magnocellular, B. Parvocellular, C. Koniocellular, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Magnocellular - Movement, depth, flickering.\nParvocellular - Colour, texture, contrast.', 'role': 'assistant'}]