This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Radiology
There is a lesion in the orbit. Can you diagnose? 
Select and explain. 
A. Choroidal melanoma, B. Ocular retinoblastoma, C. Foreign body in the orbit, D. Optic nerve drusen
A: Choroidal melanoma
Answer: A: Choroidal melanoma 
Explanation: Ans. A. Choroidal melanomaThe hyperintensity on T1 weighted MRI very specific for presence of melanin containing tumor in the orbit.The other causes of T1 hyperintensities are1. Blood products2. Proteinaceous substances3. Fat4. Gadolinium