This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lens, Subject name: Ophthalmology
[{'content': 'Cataracts in a newborn is: \nSelect and explain. \nA. Zonular, B. Nuclear, C. Snowflake, D. Cortical', 'role': 'user'}, {'content': 'Answer: A \nExplanation: a zonular refkhurana 3rd/e p. 187', 'role': 'assistant'}]