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
[{'content': 'Waves present in electroretinogram are all EXCEPT: \nSelect and explain. \nA. a wave, B. bwave, C. c wave, D. d wave', 'role': 'user'}, {'content': 'Answer: D \nExplanation: ANSWER: (D) d waveREF: Khurana 4th ed p. 489Electroretinogram is composed of:a wave : Rods and Conesb wave : Muller cellsc wave: Pigment epithelium', 'role': 'assistant'}]