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': 'During cataractogenesis lens stria appear at first in: \nSelect and explain. \nA. Upper nasal quadrant, B. Lower nasal quadrant, C. Upper temporal quadrant, D. Lower temporal quadrant', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Lower nasal quadrant', 'role': 'assistant'}]