This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
Facial N. stimulation during testing of nerve indicated by contraction of muscle 
Select and explain. 
A. Temporalis, B. Masseter, C. Sternoleidomastoid, D. Orbicularis oris
D: Orbicularis oris
Answer: D: Orbicularis oris 
Explanation: The orbicularis oris muscle is a sphincter muscle that encircles the mouth.It lies between the skin and the mucous membranes of the lips, extending upward to the nose and down to the region between the lower lip and chin.It is sometimes called the kissing muscle because it causes the lips to close and pucker. <img src=" /> ref - BD chaurasia 6e vol3 pg 66