This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
Light entering the eye first passes through _______ retinal layer? 
Select and explain. 
A. Inner nuclear layer, B. Outer nuclear layer, C. Outer plexiform Layer, D. Retinal ganglion layer
D: Retinal ganglion layer
Answer: D: Retinal ganglion layer 
Explanation: Light passes through the retinal ganglion layer, the most anterior layer of the retina. Light then passes through other layers of the retina until it reaches the photoreceptors in the posterior region of the retina. Retina is organised into 10 layers or zones where distinctive components are clustered together to form continuous strata. Light passes in the direction: Vitreous humor(anterior) - Choroid (most posterior) encountering the cell layers in that direction (ganglion cell layer - photoreceptor) Visual processing/Phototransduction occurs in the opposite direction (Photoreceptors - Ganglion cell layer) Ref: Guyton and Hall 13th edition Pgno: 674