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
'Foification spectra' are feature of 
Select and explain. 
A. Mature cataract, B. Immature cataract, C. Amaurosis Fugax, D. Migraine
B: Immature cataract
Answer: B: Immature cataract 
Explanation: 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