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': 'Mucopolysaccharide hyaluronic acid is present in – \nSelect and explain. \nA. Vitreous humor, B. Cornea, C. Blood vessels, D. Lens', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]