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': 'In the grading of trachoma, trachomatous inflammation–follicular is defined as the presence of – \nSelect and explain. \nA. 5 or more follicles in the lower tarsal conunctiva, B. 3 or more follicles in the lower tarsal conjunctiva, C. 5 or more follicles in the upper tarsal conjunctiva, D. 3 or more follicles in the upper tarsal conjunctiva', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Under WHO classification, trachocomatous inflammation follicular is defined as at least 5 or more follicles of at least 0.5 mm diameter on upper tarsal conjunctiva (for details see the table of WHO classification in the text of this chapter).', 'role': 'assistant'}]