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': 'Fistula tests stimulates \nSelect and explain. \nA. Lateral semicircular canal, B. Posterior semicircular canal, C. Round window, D. Anterior semicircular canal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]