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
The facial muscle for facial expression of frowning: 
Select and explain. 
A. Zygomaticus major, B. Corrugator supercili and procerus, C. Dilator naris and depressor septi, D. Depressor anguli oris
B: Corrugator supercili and procerus
Answer: B: Corrugator supercili and procerus 
Explanation: A few of the common facial expressions and the muscles producing them are
given below.
1. Smiling and laughing: Zygomaticus major
2. Sadness: Levator labii superioris and levator anguli oris
3. Grief: Depressor anguli oris
4. Anger: Dilator naris and depressor septi
5. Frowning: Corrugator supercilli and procerus
6. Horror, terror and fright: Platysma
7. Surprise: Frontalis
8. Doubt: Mentalis
9. Grinning: Risorius
10. Contempt: Zugomaticus minor
11. Closing the mouth: Orbicularis oris
12. Whistling: Buccinator, and orbicularis oris