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
Most recent type of denture adhesive is: 
Select and explain. 
A. Salts of Gontrez, B. Natural gums, C. Cellulose based salts, D. Acrylic adhesive
A: Salts of Gontrez
Answer: A: Salts of Gontrez 
Explanation: None