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
Premature exfoliation of the primary mandibular
canine is the most often the sequelae of which of the following: 
Select and explain. 
A. Caries, B. Trauma, C. Serial tooth extraction, D. Arch length inadequacy
D: Arch length inadequacy
Answer: D: Arch length inadequacy 
Explanation: None