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': 'Which of the following is present in cornea ? \nSelect and explain. \nA. Hyaluronic acid, B. Chondroitin sulfate, C. Dermatan sulfate, D. Heparan sulfate', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Chondroitin sulfate", 'role': 'assistant'}]