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': 'Pathognomonic feature of trachoma is: \nSelect and explain. \nA. Bulbar papillae, B. Palpebral papillae, C. Bulbar follicles, D. Palpebral follicles', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Bulbar follicles', 'role': 'assistant'}]