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
Stuart instrument gnathoscope is: 
Select and explain. 
A. Non-adjustable articulator., B. Semi adjustable articulator., C. Fully adjustable articulator., D. None
C: Fully adjustable articulator.
Answer: C: Fully adjustable articulator. 
Explanation: None