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
Water tree phenomenon is seen in 
Select and explain. 
A. Generation 1 DBA, B. Generation 4 DBA, C. Generation 6 DBA, D. Generation 7 DBA
D: Generation 7 DBA
Answer: D: Generation 7 DBA 
Explanation: Water tree phenomenon is microscopic appearance in cured layer of dentin adhesive due to incomplete water evaporation. Seen in 7th generation Dentin Bonding Agent.