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: ENT
Teunissen's classification is used in classification of congenital anomalies of: 
Select and explain. 
A. Middle ear, B. Larynx, C. Trachea, D. Pharynx
A: Middle ear
Answer: A: Middle ear 
Explanation: Historically, congenital malformations of the ear have been divided into major and minor types with the latter limited to the middle ear alone. Teunissen's classification system is based on the site of involvement and aids in determining the appropriateness for surgery.