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': 'Cicatrisisng trachoma is seen in - \nSelect and explain. \nA. Stage-1, B. State-2, C. Stage-3, D. Stage-4', 'role': 'user'}, {'content': "Answer: C \nExplanation: McCallan's classification-McCallan in 1908 divided the clinical course of trachoma into 4 stages. Stage 1 Stage 2 Stage 3 Stage 4 (Incipient trachoma) (Established tracoma) (Cicatrisisng trachoma) (Healed trachoma) Hyperaemia of palpebral Appearance of Scarring of palpebral Disease is cured or is not conjunctivapapillae mature folliucle & markable Sequelae to cicatrisation Immature follicle conjunctiva Scars are easily visible as cause symptoms Mild superfecial punctate Progressive corneal white bands keratopathy pannus Necrosis Stage 2 is fuher subdivided into :- o 2a (IIa) :- Presence of mature follicles o 2b (IIb):- Marked papillary hyperplasia Ref: Parson's 22nd/e p.174 & 21st/e p.174", 'role': 'assistant'}]