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
Space regaining is indicated in all of the following except 
Select and explain. 
A. One or more permanent teeth have been lost, B. Some space in the arch has been lost due to mesial drift of 1st permanent molar, C. Mixed dentition analysis shows that once the lost space is gained back, there will not be any arch length-tooth material discrepancy, D. 1st molars are in end to end relation due to Class II skeletal base and prognathic maxilla
D: 1st molars are in end to end relation due to Class II skeletal base and prognathic maxilla
Answer: D: 1st molars are in end to end relation due to Class II skeletal base and prognathic maxilla 
Explanation: None