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: Anatomy
[{'content': 'The angle that tympanic membrane makes with the horizontal plane is ? \nSelect and explain. \nA. 15deg, B. 25deg, C. 45deg, D. 55deg', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is `c' i.e., 45degThe tympanic membrane slants downward and inward obliquely, so that it forms an angle of 30 - 45deg with the floor of horizontal canal.", 'role': 'assistant'}]