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
Which of the following compares the prominence of the chin compared with the prominence of the lower incisors? 
Select and explain. 
A. Steiners sticks, B. IMPA, C. Holdaway ratio, D. A-Pog line
C: Holdaway ratio
Answer: C: Holdaway ratio 
Explanation: The prominence of the chin (pogonion) compared with the prominence of the lower incisor establishes the balance between them: the more prominent the chin, the more prominent the incisor can be, and vice versa. This important relationship is often referred to as the Holdaway ratio.
Ref: Contemporary orthodontics, William Proffit, 4th edition page 209