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': "All are corneal signs of trachoma except- \nSelect and explain. \nA. Herbe follicles, B. pannus, C. Opacity, D. Arlt's line", 'role': 'user'}, {'content': 'Answer: D \nExplanation: 1. Superficial keratitis may be present in the upper pa. 2. Herbe follicles refer to typical follicles present in the limbal area. 3. Pannus i.e., infiltration of the cornea associated with vascularization is seen in upper pa 4. Corneal ulcer may sometime develop at the advancing edge of pannus. 5. Herbe pits are the oval or circular pitted scars, left after healing of Herbe follicles in the limbal area 6. Corneal opacity may be present in the upper pa Ref: A K KHURANA COMPREHENSIVE OPHTALMOLOGY,E4,page-65 ref img', 'role': 'assistant'}]