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
Which of the following is not of prognostic significance to choroidal melanoma ? 
Select and explain. 
A. Presence of retinal detachment, B. Size of the tumour, C. Cytology of the tumor cells, D. Presence of extraocular extension
A: Presence of retinal detachment
Answer: A: Presence of retinal detachment 
Explanation: Prognosis of choroidal melanoma depends upon :-

Cell type
Size of tumor
Location of tumor
Evidence of invasion (extrascleral or vortex vein)
Age of the patient
Cytology
Chromosomal abnormalities.