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': 'An optic nerve injury may result in all the following except- \nSelect and explain. \nA. Loss of vision in that eye, B. Dilatation of pupil, C. Ptosis, D. Loss of light reflex', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Features of optic nerve injury are:-\n\nLoss of vision/decreased visual acuity.\nLoss of direct light reflex on the affected side with preservation of ipsilateral consensual light reflex. Loss of consensual light reflex on contralateral side with preservation of contralateral direct light reflex.\nRelative afferent pupillary defect (RAPD) or Marcus Gun pupil. This is the first sign.\nPreservation of near reflex (convergence / accommodation reflex) as optic nerve is not involved in the pathway of near reflex.\nDiminished light brighness sensitivity and contrast sensitivity.\nCentral or centrocaecal scotoma.\nDiilatation of pupil.', 'role': 'assistant'}]