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': 'Objective assessment of the refractive state of the eye is termed – \nSelect and explain. \nA. Retinoscopy, B. Gonioscopy, C. Ophthalmoscopy, D. Keratoscopy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Objective refraction methods are retinoscopy, refractometry and keratometry.', 'role': 'assistant'}]