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
Incremental lines of striae of Retzius denote: 
Select and explain. 
A. Active period., B. Rest Period., C. Mixed activity., D. Hyperactive but normal period.
B: Rest Period.
Answer: B: Rest Period. 
Explanation: None