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
Which of the following is a foldable rubber dam frame? 
Select and explain. 
A. Starlite visi frame, B. Young's metal frame, C. Nygaard-Ostby, D. Le cadre articule
D: Le cadre articule
Answer: D: Le cadre articule 
Explanation: None