Stridor in adults is most commonly caused by: (LQ)
|C||Acute severe asthma|
|D||Toxic gas inhalation|
The answer to this question can be derived by exclusion.
Reinke's edema leads to hoarseness of voice and not stridor. (Dhingra 5th/ed, p 311, 6th/ed p 292) Ruling out option 'a:
a. Acute severe asthma also does not lead of stridor.
b. Toxic gas inhalation does not lead to stridor. So we are left with one option. malignancy.