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': 'The biochemistry of cataract formation is –a) Hydration intumescenceb) Denaturation of lens proteinsc) Slow sclerosisd) All of the above \nSelect and explain. \nA. ac, B. ab, C. ad, D. bc', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Marked hydration of lens and coagulation & denaturation of lens proteins are seen in cortical senile cataract.\nThere is intensification of nuclear sclerosis (not slow sclerosis).', 'role': 'assistant'}]