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': 'In which nystagmus occurs when the patient looks straight: \nSelect and explain. \nA. Latent, B. Detional, C. Optokinetic, D. Central', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Optokinetic', 'role': 'assistant'}]