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 responsible for frowning: 
Select and explain. 
A. Zygomaticus major, B. Corrugator supercilii and procerus, C. Dilator naris and depressor septi, D. Depressor anguli oris
B: Corrugator supercilii and procerus
Answer: B: Corrugator supercilii and procerus 
Explanation: None