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
Angiography of Choroidal melanoma shows 
Select and explain. 
A. Collar stud appearance, B. Mushroom shape appearance, C. Double circulation, D. None of the above
C: Double circulation
Answer: C: Double circulation 
Explanation: Choroidal melanoma
B-scan ⇒ Collar stud appearance / Mushroom shape appearance
Angiography ⇒ Double circulation