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': 'Muscle of mastication are derivative of \nSelect and explain. \nA. 1st pharyngeal arch, B. 2nd pharyngeal arch, C. 3rd pharyngeal arch, D. 4th pharyngeal arch', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]