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: Dental
Face bow measures relationship of maxilla to 
Select and explain. 
A. Opening & closing axis, B. Mandible, C. Zygomatic bone, D. None of the above
A: Opening & closing axis
Answer: A: Opening & closing axis 
Explanation: None