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
[{'content': 'The facial muscle responsible for frowning: \nSelect and explain. \nA. Zygomaticus major, B. Corrugator supercilii and procerus, C. Dilator naris and depressor septi, D. Depressor anguli oris', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]