This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Retina, Subject name: Ophthalmology
Which is the second order neuron in optic pathway? 
Select and explain. 
A. Bipolar cells, B. Ganglionic cells, C. rods and cones, D. Astrocytes
A: Bipolar cells
Answer: A: Bipolar cells 
Explanation: Rods and Cones are the photo-receptors not neurons Axon of Bipolar cells are neurons of first order. Axons of ganglion cells form the optic nerve, which are second order neurons. 3rd order neurons arise in the Lateral Geniculate Body and terminate in the visual coex Astrocytes are neuroglial cells which provide the suppoive network for the retinal neural cells and are not directly involved in the signal transmission