This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conjunctiva, Subject name: Ophthalmology
[{'content': 'In the grading of trachoma,trachomatous inflammations follicular is defined as the presence of \nSelect and explain. \nA. 5 or more follicles in the lower tarsal conjunctiva, B. Three or more molecules in the lower tarsal conjunctiva, C. Five or more follicles in upper tarsal conjunctiva, D. Three or more follicles in upper tarsal conjunctiva', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The pneumonic is FIST-O Refer: Khurana 6th edition page number 65', 'role': 'assistant'}]