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 Tensor Tympani is a derivative of: 
Select and explain. 
A. 1st arch, B. 2nd arch, C. 3rd arch, D. 4th arch
A: 1st arch
Answer: A: 1st arch 
Explanation: 1st arch