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': 'The youngest lens fibres are present in: \nSelect and explain. \nA. Central core of the lens nucleus, B. Outer layer of the nucleus, C. Deeper layer of the coex, D. Superficial layer of the coex', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Superficial layer of the coex', 'role': 'assistant'}]