This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, 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: Phlyctenular conjunctivitis is a type IV hypersensitivity reaction to endogenous allergen.\nPreviously Tuberculous proteins were considered as the most common cause. Staphylococcal proteins are now thought to account for most of the cases.\nPeak age group is 3 -15 years with slight female preponderance.\nPhlyctens are seen on the bulbar conjunctiva, generally at or near the limbus.', 'role': 'assistant'}]