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
Pseudoproptosis caused by- 
Select and explain. 
A. Buphthalmos, B. Meningioma of optic nerve, C. Orbital cellulitis, D. Dermoid cyst
A: Buphthalmos
Answer: A: Buphthalmos 
Explanation: *Pseudoproptosis is a condition in which the eyeball appears to be proptosed but actually there is no forward displacement. The causes are Buphthalmos (congenital glaucoma), high myopia, upper lid retraction, Paralysis of the extrinsic muscles, stimulation of muller muscle by cocain, shallow orbit as in craniofacial dysostosis. Ref: Parson's 22nd/e p.304