This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnosis and Treatment of Retina, Subject name: Ophthalmology
A patient came to eye OPD with h/o dactylitis, anemia and growth retardation. In fundus there is sea fan neovascularization and salmon patches. What is the probable diagnosis 
Select and explain. 
A. Syphillis, B. Sickle cell anemia, C. Toxoplasma, D. Histoplasmosis
B: Sickle cell anemia
Answer: B: Sickle cell anemia 
Explanation: The presentation is typical of sickle cell retinopathy Sickle cell Retinopathy SS genotype causes more severe systemic disease than SC and S-Thal genotypes, while the SC and S-Thal genotypes present with a greater incidence of ocular manifestations, including proliferative sickle cell retinopathy. The underlying systemic and ocular manifestations of SCD (Sickle Cell Disease) are a result of vaso-occlusive ischemia due to the blocking of blood vessels by sickle-shaped erythrocytes. Figure 1. Salmon-patch Figure 2. Sea fan formation with neovascularization.