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 cements is contraindicated in mouth breathers: 
Select and explain. 
A. Silicate, B. ASPA, C. Polycarboxylate, D. Zinc phosphate
A: Silicate
Answer: A: Silicate 
Explanation: None