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': 'Which of the following compares the prominence of the chin compared with the prominence of the lower incisors? \nSelect and explain. \nA. Steiners sticks, B. IMPA, C. Holdaway ratio, D. A-Pog line', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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.\nRef: Contemporary orthodontics, William Proffit, 4th edition page 209', 'role': 'assistant'}]