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
Amaurosis fugax is due to- 
Select and explain. 
A. TIA, B. Tobacco, C. Optic neuritis, D. Papilloedema
A: TIA
Answer: A: TIA 
Explanation: Amaurosis fugax is sudden temporary and painless loss of vision due to transient failure of retinal circulation.
It may occur in carotid transient ischemic attack (TIA).