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
[{'content': 'Enamel rods at the cervical area and at the occlusal edge and incisal tip in permanent teeth are \nSelect and explain. \nA. Straight, B. Shallow, C. Bent, D. Curved', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]