<prompt> In the grading of trachoma, trachomatous inflammationfollicular is defined as the presence of5 or more follicles in the lower tarsal conunctiva3 or more follicles in the lower tarsal conjunctiva5 or more follicles in the upper tarsal conjunctiva3 or more follicles in the upper tarsal conjunctiva  <response>: 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. 