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': 'Anterior segment of the eyeball includes structures lying in front of the: \nSelect and explain. \nA. Iris, B. Crystalline lens, C. Vitreous body, D. Cornea', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Cornea', 'role': 'assistant'}]