This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Conjunctiva, Subject name: Ophthalmology
[{'content': 'A 7 yr patient came to opd with nodule on conjunctiva. He has history of taking TB treatment in the past. The nodule with has now encroached the limbus. What is the possible diagnosis. \nSelect and explain. \nA. Trachoma, B. Vernal keratoconjunctivits, C. Phylectenular keratoconjunctivitis, D. Limbus stem cell deficiency', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The hints point towards phlyctenular keratoconjunctivitis Phlyctenular conjunctivitis * Nodular response of conjunctival epithelium to endogenous antigen * Organisms: TB, S. aureus (mc), M. axenfield * Age: 3-15 yr * Girls > Boys * Predisposition in Low Socioeconomic status, Unhygenic surroundings Pathophysiology * Stage of Nodule Formation * Ulceration * Granulation * Healing Types : Conjunctival Involvement * Simple * Necrotizing * Miliary Corneal Involvement * Ulcerative: Sacrofulaceous/ Fascicular/ Miliary * Diffuse infiltative Treatment * Topical steroids * Antibiotic ointment * Atropine (1%) in case of corneal involvement', 'role': 'assistant'}]