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': 'In human corneal transplantation, the donor tissue is – \nSelect and explain. \nA. Synthetic polymer, B. Donated human cadaver eyes, C. Donated eyes from live human beings, D. Monkey eyes', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In corneal transplantation or keratoplasty the diseased cornea is removed and replaced with healthy cornea, obtained from cadavers.', 'role': 'assistant'}]