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 of 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: Ans. Ptosis', 'role': 'assistant'}]