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: Anatomy
Facial N. stimulation during testing of nerve indicated by contraction of muscle: 
Select and explain. 
A. Temporalis, B. Masseter, C. Sternoleidomastoid, D. Orbiculatris oris
D: Orbiculatris oris
Answer: D: Orbiculatris oris 
Explanation: D i.e. Orbicularis oris