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': 'In Optic neuritis in children, all symptoms are present EXCEPT - \nSelect and explain. \nA. Afferent pupillary defect, B. Headache and vomiting, C. Pain on movements of eye ball, D. Sudden vision loss', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Optic neuritis cause sudden loss of vision with pain on ocular movement. There is afferent pupillary defect (RAPD).\nHeadache and vomiting are symptoms of increased ICT, which occur in papilloedema not in papillitis (optic neuritis).', 'role': 'assistant'}]