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': 'Prussak space is in \nSelect and explain. \nA. Epitympanum, B. Mesotympanum, C. Hypotympanum, D. Inner Ear', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]