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
In which nystagmus occurs when the patient looks straight: 
Select and explain. 
A. Latent, B. Detional, C. Optokinetic, D. Central
C: Optokinetic
Answer: C: Optokinetic 
Explanation: Optokinetic