This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Optic Nerve, Subject name: Ophthalmology
[{'content': 'Unilateral papilloedema with optic atrophy on the other side is a feature of \nSelect and explain. \nA. Fisher syndrome, B. Foster-kennedy syndrome, C. WAGR syndrome, D. Vogt-Kayanagi-Harada syndrome', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (Foster kennedy syndrome): Ref: 241-P, 285-KH (34-KH 4th) (545-Ghai 7th)* Unilateral papilloedema with or without optic atrophy on the other side suggests a tumour of the opposite olfactory groove or orbital surface of the frontal lobe or of the pituitary body - FOSTER - KENNEDY - SYDNROME', 'role': 'assistant'}]