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': 'Optical coherence tomography is most useful in disorders of: \nSelect and explain. \nA. Macula, B. Crystalline lens, C. Refractive errors, D. Intraocular tumours', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Macula', 'role': 'assistant'}]