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': 'A case of injury to right brow due to a fall from scooter present with sudden loss of vision in the right eye.The pupil shows absent direct reflex but a normal consensual pupillary reflex is present. The fundus is normal. The treatment of choice is- \nSelect and explain. \nA. Intensive intravenous corticosteroids as prescribed for spinal injuries to be instituted within six hours, B. Pulse methyl Prednisolone 250 mg four times daily for three days, C. Oral Prednisolone 1.5 mg/kg body weight, D. Emergency optic canal decompression', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sudden loss of vision, absent Ipsilateral direct light reflex and normal ipsilateral consensual light reflex suggest the diagnosis of optic nerve injury.\nWithin 8 hours of injury megadose of iv steroid (methylprednisolone) should be given. If there is no response or deterioration, optic canal decompression should be done. If vision is improving, steroids should be tapered gradually. If on tapering steroids, vision deteriorates, optic canal decompression is indicated.', 'role': 'assistant'}]