This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
Intraorbital calcification in a patient with proptosis is observed in all except: 
Select and explain. 
A. Retinoblastoma, B. Orbital varix, C. Hydatid cyst, D. Pseudotumour
D: Pseudotumour
Answer: D: Pseudotumour 
Explanation: Ans. Pseudotumour