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 are first order neuron in optic pathway? 
Select and explain. 
A. Bipolar cells, B. Ganglionic cells, C. Cells of lateral geniculate body, D. Astrocytes
A: Bipolar cells
Answer: A: Bipolar cells 
Explanation: Ans. is 'a' i.e., Bipolar cells In visualpathway Sensory organs -Photoreceptors (Rods & cones) Neurons of first rder -3 Axon of bipolar cells (in Retina) Neurons of second rder - Axons of ganglionic cell (Retina i.e., Optic disc,Optic nerve, Optic chiasma, optic tracts) Neurons of third order - Axons from nerve cells in lateral geniculate body (optic adiation)