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
[{'content': 'Second-order neuron \nSelect and explain. \nA. Optic nerve, B. MGB, C. LGB, D. Layer of retina', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Second order neurons are the ganglionic cells in ganglionic cell layer of retina. The axons of the ganglionic cells form optic nerve. The optic nerve leaves the eye and terminates in lateral geniculate body. Ref: guyton and hall textbook of medical physiology 12 edition page number:672,673,674', 'role': 'assistant'}]