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
External manifestations of lines of Retzius which are present as transverse wave line groove are called as: 
Select and explain. 
A. Incremental line of Von Ebner., B. Incremental line of Owen., C. Perikymata., D. Enamel cuticle.
C: Perikymata.
Answer: C: Perikymata. 
Explanation: Perikymata is the external manifestation of lines of retzius.