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
Cervical bulge. True is 
Select and explain. 
A. Enamel rods at cervical region directed occlusally, B. Results in constriction at cervical region, C. Is characteristic of deciduous teeth, D. All of the above
C: Is characteristic of deciduous teeth
Answer: C: Is characteristic of deciduous teeth 
Explanation: None