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
First order neuron of visual pathway - 
Select and explain. 
A. Photoreceptor, B. bipolar neuron, C. lateral geniculate body, D. all of the above
A: Photoreceptor
Answer: A: Photoreceptor 
Explanation: Answer-:A: photoreceptorRods and cones are the first-order receptor cells that respond directly to light stimulation.Bipolar neurons are the second-order neurons that relay stimuli from the rods and cones to the ganglion cells.Ganglion cells third-order neurons that form the optic nerve (CN II).