This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
The only neurons showing action potential are 
Select and explain. 
A. Amacrine cells, B. Ganglionic cells, C. Cells of lateral geniculate body, D. Rods and cones
B: Ganglionic cells
Answer: B: Ganglionic cells 
Explanation: Their axons form optic nerve and leave the retina, hence they are the only output cells from the retina. They are the only retinal cells capable of producing an action potential Ref: Ganong 25th ed/page 178