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
Sublingual chlorhexidin is called 
Select and explain. 
A. Atridox, B. Arestin, C. periotest, D. Periochip
D: Periochip
Answer: D: Periochip 
Explanation: None