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': 'What is deposited in band keratopathy \nSelect and explain. \nA. CaSO4, B. CaPO4, C. MgSO4, D. MgPO4', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer- B. CaPO4Band keratopathy is characterized by the deposition ofcalcium and phosphorus salts (especially hydroxyapatite) in a bandlike pattern in the anterior layers of the cornea. The keratopathy is usually limited to the interpalpebral area. Symptoms include irritation, injection, and blurring of vision.Chronic eye diseases (most common cause)', 'role': 'assistant'}]