This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Ophthalmology
[{'content': 'Cherry red spot is seen in all of the following except \nSelect and explain. \nA. Spranger disease, B. Faber disease, C. Retinitis pigmentosa, D. Central retinal aery thrombosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: .', 'role': 'assistant'}]