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: Physiology
Which are first-order neuron in the 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: Visual pathway

Receptors- Rods & Cons
First order neurons- Bipolar cell axons (In retina)
Second order neurons- Ganglion cell axons ( In optic disc, optic nerve, optic chiasma, optic tracts)
Third order neurons- Lateral geniculate body nerve cell axons (optic radiation)