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
Which of the following event has little or no significance? 
Select and explain. 
A. Mandibular incisor erupting before mandibular molar, B. Mandibular canine erupting before mandibular premolar, C. Mandibular 2nd premolar erupting before mandibular 2nd molar, D. Maxillary premolar and canine erupting before maxillary 2nd molar
A: Mandibular incisor erupting before mandibular molar
Answer: A: Mandibular incisor erupting before mandibular molar 
Explanation: None