This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Retina, Subject name: Ophthalmology
[{'content': 'Argus 2 implants have been experimentally tried in: \nSelect and explain. \nA. Failed penetrating keratoplasty, B. Retinitis pigmentosa, C. Advanced Glaucoma, D. Optic atrophy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Argus 2 retinal implants have been tried in Retinitis pigmentosa patients. Treatment modalities for Retinitis Pigmentosa Crisp Car technique Low vision aids Bionic eye Argus 2 retinal implant High dose vitamin A are the modalities tested', 'role': 'assistant'}]