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: Medicine
[{'content': 'In bronchial asthma glucorticoids - \nSelect and explain. \nA. Act as potent bronchodilators, B. Reduce airway inflammation, C. Inhibit degranulation of mast cells, D. Block the action of humoral mediators', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]