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': 'All are true about phlyctenular conjunctivitis except: \nSelect and explain. \nA. It is type-IV cell mediated hypersensitivity, B. Allergens are endogenous as well as exogenous, C. Incidence is higher in girls than boys, D. Nodular lesion usually occurs near the limbus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Allergens are endogenous as well as exogenous', 'role': 'assistant'}]