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 unilateral past pointing nystagmus the site of lesion is: \nSelect and explain. \nA. Cerebellar hemisphere, B. Lateral semicircular canal, C. Flocculo-nodular lobe, D. Superior semicircular canal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Cerebellar hemisphere', 'role': 'assistant'}]