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
Spacing in anterior teeth in deciduous dentition 
Select and explain. 
A. Common and desirable, B. Uncommon and undesirable, C. Common and undesirable, D. Uncommon
A: Common and desirable
Answer: A: Common and desirable 
Explanation: None