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': 'Stimulation of posterior semicircular canal produces - \nSelect and explain. \nA. Horizontal nystagmus, B. Vertical nystagmus, C. Rotatory nystagmus, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]