This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Most common cause of bilateral Proptosis is 
Select and explain. 
A. Thyrotoxicosis, B. Cavernous sinus thrombosis, C. Retinoblastoma, D. Pseudotumers
A: Thyrotoxicosis
Answer: A: Thyrotoxicosis 
Explanation: Most common cause of either bilateral or unilateral proptosis in adults is thyroid ophthalmopathy Refer khurana 6/e