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': 'Crystalline lens is derived embryologically from the: \nSelect and explain. \nA. Surface ectoderm, B. Neuroectoderm, C. Surface ectoderm and mesoderm, D. Neuroectoderm and mesoderm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Surface ectoderm', 'role': 'assistant'}]