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
Stridor in adults is most commonly caused by: 
Select and explain. 
A. Reinke's edema, B. Malignancy, C. Acute severe asthma, D. Toxic gas inhalation
B: Malignancy
Answer: B: Malignancy 
Explanation: Acute severe asthma also does not lead of stridor. Toxic gas inhalation does not lead to stridor.