This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cataract, Subject name: Ophthalmology
[{'content': 'Which of the gene is most often implicated in congenital cataract and alpha crystallin mutation? \nSelect and explain. \nA. GLC3A, B. PAX6, C. PITX2, D. CRYAA', 'role': 'user'}, {'content': 'Answer: D \nExplanation: CRYAA is implicated in congenital cataract and alpha crystallin mutation.', 'role': 'assistant'}]