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
Hunter Schreger bands are: 
Select and explain. 
A. Dark and light bands of enamel seen in longitudinal ground section, B. Dark and light bands of enamel seen in horizontal ground section, C. Dark and light bands of dentin seen in longitudinal section, D. Dark and light bands of dentin seen in horizontal section
A: Dark and light bands of enamel seen in longitudinal ground section
Answer: A: Dark and light bands of enamel seen in longitudinal ground section 
Explanation: Hunter-schreger bands are due to change in direction of rods; and are regarded as a functional adaptation to minimize the risk of cleavage due to occlusal forces.