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: Ophthalmology
[{'content': 'All except one are tests for macular function? \nSelect and explain. \nA. Laser interferometry, B. Two point discrimination, C. Maddox rod test, D. Retinal ERG Electroretinogram', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Retinal ERG', 'role': 'assistant'}]