This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of orbit, Lids and lacrimal apparatus, Subject name: Ophthalmology
[{'content': 'The most common cause of proptosis in adults is \nSelect and explain. \nA. Preseptal cellulitis, B. Orbital cellulitis, C. Thyroid eye disease, D. Capillary hemangioma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Proptosis:- Ref:- A K Khurana Comprehensive Ophthalmology 7th edition; pg num:- 398', 'role': 'assistant'}]