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
Marcus Gunn pupil is a feature of: 
Select and explain. 
A. Optic neuritis, B. Papilledema, C. Ciliary ganglion lesions, D. Lesion of Edinger-Westphal nucleus
A: Optic neuritis
Answer: A: Optic neuritis 
Explanation: Ans. Optic neuritis