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 mandibular labial frenum is a fibrous band that can be influenced by 
Select and explain. 
A. Incisivus, B. Orbicularis oris, C. Caninus and incisivus, D. Incisivus and orbicularis oris
D: Incisivus and orbicularis oris
Answer: D: Incisivus and orbicularis oris 
Explanation: None