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 akin to in vivo: \nSelect and explain. \nA. Histopathology, B. Ultrasonic biomicroscopy, C. Confocal microscopy, D. Roentgen examination', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Histopathology', 'role': 'assistant'}]