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
Muscle of mastication are derivative of 
Select and explain. 
A. 1st pharyngeal arch, B. 2nd pharyngeal arch, C. 3rd pharyngeal arch, D. 4th pharyngeal arch
A: 1st pharyngeal arch
Answer: A: 1st pharyngeal arch 
Explanation: None