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
[{'content': "Stridor in adults is most commonly caused by: \nSelect and explain. \nA. Reinke's edema, B. Malignancy, C. Acute severe asthma, D. Toxic gas inhalation", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Acute severe asthma also does not lead of stridor. Toxic gas inhalation does not lead to stridor.', 'role': 'assistant'}]