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': 'Sudden, transient and painless loss of vision may be complained by the patients with all of the following diseases except: \nSelect and explain. \nA. Carotid transient ischaemic attacks, B. Papilloedema, C. Papillitis, D. Migraine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Papillitis', 'role': 'assistant'}]