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': 'Spiral field defect is a feature of: \nSelect and explain. \nA. Amblyopia exanopsia, B. Hysterical amblyopia, C. Malingering, D. Toxic amblyopia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Hysterical amblyopia', 'role': 'assistant'}]