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
ADA specification number for Resin Based Restorative material is: 
Select and explain. 
A. 26, B. 27, C. 28, D. 30
B: 27
Answer: B: 27 
Explanation: ANSI/ADA Specification No. 27—Resin-Based Filling Materials: 1997.
This standard specifies requirements for dental resin-based restorative materials supplied in a form suitable for mechanical mixing, hand mixing, or external energy activation.
Ref: Philip’s Science of Dental Materials , Anusavice , 11th edition