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: Ophthalmology
Maximum Number of cones are seen in 
Select and explain. 
A. Fovea centralis, B. Blind spot, C. Macula Lutea, D. Optic disc
A: Fovea centralis
Answer: A: Fovea centralis 
Explanation: (A) Fovea centralis # Human retina contains on average 4.6 million cones and 92 million rods, although there is significant inter-individual variation (Curcio et al 1990).# Retina:> Fovea centralis: It lies in the center of macula lutea. Cones are highly concentrated in the fovea. It is responsible for visual acuity.> Although cones populate the whole retina, their density is highest in the foveola, where approximately 7000 cones reach an average density of 199,000 cones/mm2: this area is entirely rod free.> Going outwards from the foveola, rod numbers rise, reaching a peak density in a horizontal elliptical ring at the eccentricity of the optic disc, before declining once more toward the periphery.> Cone density is 40-45% higher in the nasal compared to the temporal retina, and slightly higher interiorly than superiorly.