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 along with proptosis indicates: 
Select and explain. 
A. Involvement of ciliary ganglion, B. Compression of optic nerve, C. Compression of inferior division of 3rd nerve, D. Compression of sympathetic nerves of the eyeball
B: Compression of optic nerve
Answer: B: Compression of optic nerve 
Explanation: Ans. Compression of optic nerve