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: ENT
Bilateral proptosis and bilateral 6th nerve palsy in seen is: 
Select and explain. 
A. Cavernous sinus thrombosis, B. Meningitis, C. Hydrocephalus, D. Orbital Cellulitis
A: Cavernous sinus thrombosis
Answer: A: Cavernous sinus thrombosis 
Explanation: In cavernous sinus thrombosis, there is bilateral orbital involvement whereas in orbital cellulitis, it is unilateral.