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
The patients with class II division 1 malocclusion have 
Select and explain. 
A. Hypertonic Lower Lip, B. Hypotonic Lower lip, C. Hypertonic upper Lip, D. Hypotonic upper lip
D: Hypotonic upper lip
Answer: D: Hypotonic upper lip 
Explanation: None