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': 'Citiary muscles are embryologically derived from \nSelect and explain. \nA. Neural ectokoderm, B. Mesoderm, C. Surface actoderm, D. Neural crest', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]