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
The interarch relationship in the pre-dental stage is judged by? 
Select and explain. 
A. Dental groove, B. Gingival groove, C. Lateral sulcus, D. Transverse groove
C: Lateral sulcus
Answer: C: Lateral sulcus 
Explanation: Explanation: The gum pads get divided into a labio/buccal and a lingual portion which differentiates later. Transverse grooves separate the gum pads into 10 segments. The groove between the canine and the first molar region is called the lateral sulcus, which helps to judge the inter-arch relationship.