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
Classical monoblock in restorative and endodontic literature is: 
Select and explain. 
A. Primary monoblock, B. Secondary monoblock, C. Tertiary monoblock, D. Quartenary monoblock
B: Secondary monoblock
Answer: B: Secondary monoblock 
Explanation: The combined use of a core material and a cement/sealer in contemporary endodontic obturations and fiber post adhesion introduces additional interfaces into a monoblock. 
Secondary monoblocks are those that have two circumferential interfaces, one between the cement and dentin, the other between the cement and the core material. 
A secondary monoblock is the type of monoblock that is classically perceived in the restorative and endodontic literature.