This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuro-ophthalmology, 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: in visual sensation first order neurons lies in the bipolar cell layer of retina. Reference: textbook of comprehensive Opthalmology by AK Khurana.