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': 'Which of the following is not a true statement for retinitis pigmentosa? \nSelect and explain. \nA. Electrophysiological changes appear early in the disease before the objective signs, B. Triad includes Attenuated vessels. optic atrophy and disc edema, C. RP is associated with Cystoid macular edema, D. Argus 2 retinal implant is used as a treatment modality', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Disc edema is not considered as a pa of triad of retinitis pigmentosa. Retinitis Pigmentosa Triad: Peripheral pigmentation Optic atrophy Attenuated vessels.', 'role': 'assistant'}]