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
Most common area where prism-less or structure-less enamel is found: 
Select and explain. 
A. Cervical area., B. Cusp tip., C. Incisal edge., D. All of the above.
A: Cervical area.
Answer: A: Cervical area. 
Explanation: Most common area where prism less or structure less enamel found – Cervical area.
Least common area where prism less or structure less enamel found – Cusp tip.