This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Ophthalmology
UNILATERAL proptosis with BILATERAL sixth nerve palsy 
Select and explain. 
A. cavernous sinus thrombosis, B. thyroid ophthalmopathy, C. Retinoblastoma, D. Orbital psuedotumour
A: cavernous sinus thrombosis
Answer: A: cavernous sinus thrombosis 
Explanation: IN CAVERNOUS SINUS THROMBOSIS : Abduscent Nerve has high chance of being affected ref : ak khurana 7th ed