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': 'Retinal blood vessels are developed from – \nSelect and explain. \nA. Surface ectoderm, B. Paraxial mesoderm, C. Endoderm, D. Neuro ectoderm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Blood vessels are derived from mesoderm.', 'role': 'assistant'}]