This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea, Subject name: Ophthalmology
[{'content': 'Which form of calcium is deposited in Band shaped keratopathy \nSelect and explain. \nA. Calcium chloride, B. Calcium hydroxyapatite, C. Calcium cyanide, D. Sodium Hydroxyapatite', 'role': 'user'}, {'content': "Answer: B \nExplanation: Band Shaped Keratopathy *Calcium phosphate/ Calcium hydroxyapatite *Deposition in Bowman's membrane or conditions a/w hyperkalemia such as Hyperparathyroidism, renal failure, hypophospahatasia, Sarcoidosis, Pagets disease *Rx: EDTA,Lamellar Keratoplasty, PTK Band Shaped Keratopathy causes", 'role': 'assistant'}]