This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Orbit, Subject name: Ophthalmology
Most common cause of unilateral proptosis in adults is - 
Select and explain. 
A. Thyroid ophthalmopathy, B. Rhabdomyosarcoma, C. Orbital blow out fracture, D. Orbital cellulitis
A: Thyroid ophthalmopathy
Answer: A: Thyroid ophthalmopathy 
Explanation: Ans. is a i.e., Thyroid ophthalmopathy * The most common cause of unilateral proptosis in children is orbital cellulitis* The most common cause of unilateral proptosis in adults is thyroid ophthalmopathy.* Most common cause of bilateral proptosis in children ->> Neuroblastoma (me), Leukemia (Chloroma)* Most common cause of bilateral proptosis in adults is thyroid ophthalmopathy.