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
Enamel rods at the cervical area and at the occlusal edge and incisal tip in permanent teeth are 
Select and explain. 
A. Straight, B. Shallow, C. Bent, D. Curved
C: Bent
Answer: C: Bent 
Explanation: None