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
Most often the first sign of involvement of opposite side in cavernous sinus thrombosis is: 
Select and explain. 
A. Paralysis of opposite lateral rectus muscle, B. Proptosis of the opposite side, C. Paralysis of opposite 3rd nerve, D. All of the above
A: Paralysis of opposite lateral rectus muscle
Answer: A: Paralysis of opposite lateral rectus muscle 
Explanation: Ans. Paralysis of opposite lateral rectus muscle