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': 'Asteroid Hyalosis bodies are composed of \nSelect and explain. \nA. Iron, B. Calcium and phosphates, C. Cadmium and chloride, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer- B. Calcium and phosphatesAsteroid hyalosis is a degenerative condition of the eye involving small white opacities in the vitreous humor.The asteroid bodies are made up of hydroxyapatite, which in turn consists of calcium and phosphates.', 'role': 'assistant'}]