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': 'Maddox rod test is used for testing ? \nSelect and explain. \nA. Macular function, B. Lens opacity, C. Amount of tear production, D. Vitreous hemorrhage', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Macular function", 'role': 'assistant'}]