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': 'A child has got a congenital cataract involving the visual axis which was detected by the parents right at birth. This child should be operated – \nSelect and explain. \nA. Immediately, B. At 2 months of age, C. At 1 year of age when the globe becomes normal sized, D. After 4 years when entire ocular and orbital growth becomes normal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Congenital unilateral cataract involving visual axis requires urgent surgery, as early as possible, i.e. within days.\nHowever, you should keep in mind that surgery is inadvisable after 16 weeks (4 months) of age as the amblyopia is refractory\n\nCongenital bilateral cataract\n\nDense :- Early surgery by 4-6 weeks of age.\nPartial :- Regular follow-up.\n\nCongenital unilateral cataract\n\nDense or involving visual axis :- Urgent surgery within days.\nPartial:- Observation.', 'role': 'assistant'}]