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
Thymus glands are derived from: 
Select and explain. 
A. I pharyngeal pouch, B. II pharyngeal pouch, C. III pharyngeal pouch, D. IV pharyngeal pouch
C: III pharyngeal pouch
Answer: C: III pharyngeal pouch 
Explanation: None