This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of orbit, Lids and lacrimal apparatus, Subject name: Ophthalmology
[{'content': 'A child with unilateral white reflex and raised intraocular pressure. the required investigation are all except \nSelect and explain. \nA. Usg, B. Tonometer, C. Observation under anaesthesia, D. CT scan', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In a child, a detailed retinal examination, tonometry, corneal diameter, gonioscopy, etc can only be done under anaesthesia Refer khurana 6/e', 'role': 'assistant'}]