This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': "'Foification spectra' are feature of \nSelect and explain. \nA. Mature cataract, B. Immature cataract, C. Amaurosis Fugax, D. Migraine", 'role': 'user'}, {'content': "Answer: B \nExplanation: Foification spectra are more complicated images that can float in your vision during a migraine. These get their name from their resemblance to an aerial view of an intricately built fo. Ref ganong's review of medical physiology 25e p874", 'role': 'assistant'}]