This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Optics and refraction, Subject name: Ophthalmology
[{'content': 'No movement of Red reflex in retinoscopy - \nSelect and explain. \nA. No refractive error, B. Myopia of 3D, C. Myopia of 1D, D. Hypermetropia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In low degrees of refractive errors the shadow (red reflex) seen in the pupillary area is faint and moves rapidly with the movement of the mirror; while in high degrees of ametropia it is very dark and moves slowly. Reference : A K KHURANA OPHTALMOLOGY, Edition 4,Page-550', 'role': 'assistant'}]