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': 'Giant papillary conjunctivitis occurs as an allergic response to all except: \nSelect and explain. \nA. Contact lens, B. Intraocular lens, C. Prosthesis, D. Nylon sutures', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Intraocular lens', 'role': 'assistant'}]