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
Pulp chambers and root canals in deciduous teeth: 
Select and explain. 
A. Wide and deep, B. Shallow and narrow, C. Wide and narrow, D. Shallow and wide
D: Shallow and wide
Answer: D: Shallow and wide 
Explanation: None