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
Airway noise originating in the nose, nasopharynx and oropharynx is known as: 
Select and explain. 
A. Stridor, B. Steor, C. Both of the above, D. None of the above
B: Steor
Answer: B: Steor 
Explanation: Stridor is a harsh noise produced by turbulent airflow through a paially obstructed airway. It may be inspiratory, expiratory, or both (biphasic). The term steor is used to describe airway noise originating in the nose, nasopharynx, and oropharynx; therefore, stridor is generally of laryngeal or tracheal origin.