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': 'Phlyctenular conjunctivitis false is- \nSelect and explain. \nA. The most common cause is tuberculosis, B. The lesions are typically found near the limbus, C. Predominantly affects children, D. Is a type IV hypersensitivity reaction', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Tuberculous proteins were considered, previously, as the most common cause. Staphylococcus proteins are now thought to account for most of the cases. Age. Peak age group is 3-15 years. Phlyctenular keratoconjunctivitis is believed to be a delayed hypersensitivity (Type IV-cell mediated) response to endogenous microbial proteins. ref: A K KHURANA OPHTALMOLOGY,E4, Page-77', 'role': 'assistant'}]