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
If a flush terminal plane is present in the deciduous
dentition, then the molars will erupt: 
Select and explain. 
A. Initially in class I occlusion, B. Initially in class II occlusion, C. Initially in class III occlusion, D. Initially in end to end
D: Initially in end to end
Answer: D: Initially in end to end 
Explanation: When the deciduous second molars are in a fIush terminal plane, the permanent first molar erupts initially into a cusp-to-cusp relationship, which later transforms into a Class I molar relation using the primate spaces. Later, cusp-to-cusp relationship of the permanent first molar can be converted to a Class I relationship by the mesial shift of the permanent first molar following exfoliation of the primary molar and thus making use of the Leeway space (late mesial shift).