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: ENT
[{'content': 'Not included in Gredenigo syndrome \nSelect and explain. \nA. Retro-orbital pain, B. Ear discharge, C. Nystagmus, D. Diplopia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]