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
Arcon and non arcon articulators are types of : 
Select and explain. 
A. Non-adjustable articulators., B. Semi adjustable articulators., C. Fully adjustable articulators., D. All of the above.
B: Semi adjustable articulators.
Answer: B: Semi adjustable articulators. 
Explanation: None