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
In the grading of trachoma, trachomatous inflammation–follicular is defined as the presence of – 
Select and explain. 
A. 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
C: 5 or more follicles in the upper tarsal conjunctiva
Answer: C: 5 or more follicles in the upper tarsal conjunctiva 
Explanation: 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).